Sajuna Inui

Name: Sajuna Inui

Alias / Cosplay Name: Juju

Gender: Female

Series: My Dress-Up Darling

School: Sakuranomiya Girls’ High School (escalator-type girls’ school)

Grade: Second-year high school (one grade above Wakana Gojo and Marin Kitagawa)

Birthday: June 1 (not depicted in the original manga; given as reference)

Height: Not officially stated, but implied to be in the mid-140 cm range based on comparison with other characters

Family: Younger sister Shinju Inui

Occupation / Role: Student, hobby cosplayer, online cosplay personality

Voice Actress: Atsumi Tanezaki

Live-Action Actress: Akana Ikeda

Sajuna is a second-year student at Sakuranomiya Girls’ High School, an all-girls escalator school where she has spent most of her school life surrounded only by girls.

Despite being older than Wakana Gojo and Marin Kitagawa, her baby face and very small stature make her look like a middle schooler or even an elementary schooler to others.

Under the cosplay name Juju, she is an internet-famous cosplayer focused mainly on magical girl and children’s anime characters.

Her costume quality and photos are so good that some online fans once doubted she was even a real person.

Sajuna has a bold, confident personality and speaks her mind clearly, often coming off as a bit sharp or tsundere.

She is not shy about pointing out what she thinks, but she also has a very soft side, especially when it comes to her little sister.

She is extremely devoted to Shinju Inui and will prioritize Shinju’s wishes even at the cost of her own comfort.

If it is something Shinju wants to do, Sajuna is willing to endure things she personally dislikes, just to support her sister’s happiness.

Despite her strong presence online, Sajuna is actually very timid about scary things.

She is easily frightened by abandoned buildings, dim locations, and horror in general, and the horror game “Coffin” terrifies her so much that she cannot clear it.

Because she has always attended girls’ schools and has almost no experience interacting with boys her own age, Sajuna has little emotional immunity to them.

When Wakana Gojo, moved by her words, impulsively grabs her hand to thank her, the shock is so intense that her brain essentially “short-circuits” and she faints on the spot.

She is straightforward, occasionally prickly, and easily embarrassed, but she also takes other people’s dreams seriously and encourages them in a concise but powerful way.

When she hears Wakana’s dream of becoming a hina doll craftsman, she tells him it is a wonderful dream and firmly urges him to make it come true.

Sajuna is a very small girl with a youthful, childlike appearance and a baby face that makes her look much younger than her actual age.

Her height is not officially listed, but visual comparison to other characters suggests she is around the mid-140 cm range.

Because of her build and looks, others frequently misjudge her as a middle school or even elementary school student.

Both Wakana Gojo and Marin Kitagawa initially assume she is significantly younger than they are.

The original manga includes explicit depictions that clarify she has no pubic hair and also shows her nipples.

This detail is used largely for comedic and fanservice situations rather than plot relevance.

As a child, Sajuna longed to become a magical girl.

Even after realizing that such magic does not exist in reality, she still desperately wanted to get as close as possible to that dream.

Cosplay became the method she used to bridge the gap between reality and that fantasy.

By wearing costumes and embodying those characters, she could live out the feeling of being a magical girl, at least for a while.

Because her own dream started from such a pure, intense desire, she treats other people’s dreams with sincere respect.

She never mocks Wakana’s ambition to become a hina doll craftsman and instead offers heartfelt encouragement in a few strong words.

Sajuna’s current cosplay focus is magical girl anime and young children’s anime heroines.

Her attachment to these genres is tied to her childhood admiration for magical girls, which she has never truly outgrown.

Online, Sajuna is widely known under her cosplay handle “Juju”, a name she chose together with her sister Shinju, who manages her photography and social media.

Sajuna herself considers cosplay to be purely a hobby, with no intention of publicly pursuing fame or celebrity status.

Originally, she was satisfied simply with being able to cosplay and keep the photos as personal memories.

However, Shinju, who handles the camera, wanted to show Sajuna’s cuteness to others and asked for permission to share the photos online.

Sajuna allowed her sister to post the photos on social media, which quickly led to Juju becoming extremely popular on the internet.

Her costumes and photos are so high-quality that she became a mysterious legend among cosplayers, especially because she never appeared at events.

Many fans doubted that Juju actually existed as a real person, assuming she might be the work of heavy editing or even a fabrication.

When Marin later posts a two-shot photo with Sajuna, comments pour in saying things like “Juju is real after all,” confirming her existence to the community.

Despite this popularity, Sajuna herself is not particularly concerned with other people’s evaluations.

She does not chase likes, followers, or fame, and is content as long as she can do the cosplay she wants, primarily guided by her own and Shinju’s enjoyment.

Marin Kitagawa is a huge fan of Juju, idolizing her for both the quality of her costumes and the strength of her cosplay characters.

Before they meet, Marin views Juju as a top-tier cosplayer and a kind of unreachable goal, especially since Juju never attends events.

Sajuna first notices Marin when she stumbles upon a photo of Marin cosplaying as Shizuku from the in-universe game “Slippery Girls 2.”

Marin’s Shizuku costume was the very first outfit Wakana Gojo ever made, and the craftsmanship of the clothing instantly captures Sajuna’s attention.

When Sajuna learns that Marin will be attending a cosplay event the next day in that outfit, she secretly goes to the venue to see it in person.

There, she discreetly observes Marin and Wakana, and through their conversation discovers that Wakana is the creator of the costume.

Initially, Sajuna only plans to commission Wakana to make a costume for herself.

However, the eventual group cosplay they do together—especially seeing how deeply Marin embodies her characters, almost like a personality shift—makes Sajuna realize that it was not only the costume’s quality she fell for.

She comes to understand that what truly impressed her was the combination of Wakana’s craftsmanship and Marin’s complete immersion into character.

This realization deepens her appreciation of both Marin as a cosplayer and Wakana as a creator.

Even after their first collaboration, Sajuna stays in touch with Marin through social media.

They continue to interact, share cosplay plans, and eventually reunite for later collaborations, strengthening their friendly bond.

Wakana Gojo becomes central to Sajuna’s cosplay life once she discovers he is the one behind Marin’s Shizuku costume.

She is stunned by the professional-level quality of his first cosplay outfit and instantly decides she wants him to make one for her.

To find him, Sajuna stealthily follows Wakana from the cosplay event venue back to his home.

Through this bold act of tailing, she discovers that he lives at and works out of the “Gojo Doll Shop,” which is also where he practices making hina dolls.

Later, Sajuna visits the shop on a rainy day to formally request a costume from Wakana.

Drenched by the rain, she is kindly offered a bath by Wakana’s grandfather, Kaoru Gojo, before she properly introduces herself.

This leads to a major “accident” when Wakana, unaware of who is bathing, becomes suspicious of possible intruders and goes to check.

He carelessly opens the door to the changing area and runs into a completely naked Sajuna, who slips and falls, exposing everything—including the fact that she is completely hairless below.

Mortified and furious, Sajuna uses this embarrassing incident as a kind of leverage when she makes her request.

Half joking and half serious, she strong-arms Wakana into agreeing to make her cosplay costume, reminding him that he saw her fully naked.

Despite this rocky start, Sajuna quickly comes to respect Wakana’s enormous dedication to craftsmanship.

She recognizes how seriously he approaches costume-making and admires his honest passion and painstaking accuracy.

As they collaborate more, she acknowledges Wakana’s dream of becoming a hina doll artisan and pushes him to pursue it with confidence.

Her short but firm encouragement—telling him it is a lovely dream and that he must make it come true—has a powerful emotional impact on him.

Shinju Inui is Sajuna’s beloved younger sister and the person she treasures above anyone else.

Shinju is the one who takes photos of Sajuna’s cosplay and manages Juju’s online presence, including posting pictures and planning their visual concepts.

The cosplay name “Juju” itself was created by Shinju after discussing it with Sajuna.

Although Sajuna is the one in costume, the Juju brand is essentially a joint project between the sisters.

Sajuna will readily sacrifice her own comfort to prioritize Shinju’s wishes.

For example, when Shinju wants to join a cosplay collaboration involving a horror game, Sajuna initially rejects the idea because she hates horror, but changes her mind after seeing her sister’s disappointed face.

Even though horror terrifies her and she cannot even clear the game “Coffin,” Sajuna forces herself to participate in the group cosplay.

She puts on a brave front as “Shinju’s big sister” and endures the entire horror-themed shoot so that Shinju can enjoy the experience.

Their dynamic is one of the most wholesome relationships in the series.

Shinju’s love of photography and Sajuna’s love of magical girl cosplay complement each other perfectly, and both girls support each other’s growth.

Interestingly, when Sajuna later takes a break from cosplay to prepare for university entrance exams, Shinju is the one who debuts at cosplay events first.

This means the younger sister actually sets foot into the physical cosplay scene before her older, more famous online counterpart.

Discovering Wakana’s Work

Sajuna’s main involvement begins when she finds Marin’s Shizuku cosplay photos online.

Taken by the costume’s craftsmanship, she becomes determined to find the creator.

After learning from Marin’s social media that the same costume will appear at a cosplay event the next day, she visits the event in secret.

She quietly eavesdrops on Marin and Wakana’s conversation, learns his name, and then trails him home to identify where he lives and works.

She discovers that he resides in the Gojo Doll Shop, run by his grandfather Kaoru Gojo.

This discovery sets the stage for her to later approach him with a direct request for costume creation.

The Bathroom Incident and Costume Request

On the day she goes to see Wakana and make her request, Sajuna is caught in a sudden downpour and arrives at the Gojo home soaked.

Kaoru, seeing her drenched, kindly allows her to use their bathroom.

While she is bathing and changing, Wakana, unaware of the situation and suspicious about an unknown presence in the house, goes to check the bathroom area.

He accidentally collides with the freshly bathed Sajuna, causing her to slip and leading to a full, extremely embarrassing exposure.

After recovering from the shock and humiliation, Sajuna confronts Wakana properly.

She introduces herself, explains that she is Juju, and insists that he create a cosplay costume for her, casually using his accidental peeping as a bargaining chip.

Black Lily and Joint Cosplay

The costume Sajuna wants is Black Lily from the in-universe magical girl show “Flower Princess Blaze!!.”

Marin is also a huge fan of the same series and especially loves Black Lily’s older sister, Black Robelia (Neon Nikaidou).

When Marin learns that Sajuna wants a Black Lily outfit, she immediately asks if they can do a joint cosplay with Sajuna as Black Lily and Marin as Black Robelia.

Sajuna initially refuses, preferring to focus on herself and the cost of the project.

However, Marin offers to help pay for part of the studio rental fee so more of the budget can go into Sajuna’s costume.

Tempted by the chance to improve the costume quality, Sajuna relents and agrees to the plan.

During the preparations and the studio photoshoot, Sajuna and Shinju share their cosplay knowledge with Marin and Wakana.

They give them practical advice on posing, lighting, photography workflow, and how to make the most of a studio environment.

The shoot includes a surprise: Shinju herself cosplays, which Sajuna had not expected.

The entire session ends successfully, and although Sajuna verbally plays down how much this collaboration means to her, her expressions and reactions clearly show she is happy.

Later Appearances and the Horror Game Shoot

Sajuna reappears later in the story (around volume 10, chapter 72) when Marin and company invite her for another group cosplay based on the horror game “Coffin.”

She immediately rejects the idea because she is terrified of horror in general and struggled even watching or playing it.

However, when she sees Shinju’s face fall in disappointment, Sajuna reconsiders.

Out of love for her sister, she agrees to join, determined to act like a fearless big sister even though she is inwardly panicking.

During the actual shoot, she maintains her composure as best she can and works through the fear until the session is complete.

By the end, she has once again pushed her own limits for Shinju’s sake and strengthened both their cosplay experience and their bond.

Pre-Graduation Doubts and Encouragement

Before she advances to her third and final year of high school, Sajuna begins to feel uneasy about how long she is allowed to continue cosplaying.

She wonders, almost anxiously, “How long am I allowed to go on with this?” as adult responsibilities and the future start to weigh on her.

Around this time, she receives a surprise proposal from Ito Suzuka and Honda Miyako.

They suggest she cosplay as Black Robelia, a character she initially resists because she feels her own image does not match the character’s glamorous, mature vibe.

Sajuna becomes angry and rejects the idea at first, feeling it would be out-of-character cosplay that does not suit her carefully maintained image.

But with patient persuasion from Suzuka and Miyako, she eventually agrees to try it.

When she actually cosplays Black Robelia, Shinju reacts with overwhelming praise and admiration.

Seeing her sister’s happiness and hearing the positive feedback, Sajuna sincerely thanks Suzuka and Miyako for their idea and support.

In that same conversation, she confides her worries about how long she can keep going with cosplay.

Listening to the older women’s experiences and perspectives, Sajuna reaches a quiet but solid decision to continue cosplaying as long as she can and wants to.

As Sajuna advances to her third year of high school, she has to prepare for university entrance exams.

Because of the heavy academic burden, she temporarily suspends her cosplay activities.

Even during this break, the series does not depict her formally quitting cosplay.

Instead, it is an understandable, practical pause in her hobby rather than a clean ending.

During this time, Shinju enters high school and finally makes her own cosplay event debut.

In a playful twist of fate, the younger sister appears at an event before the famously online-only Juju ever does, meaning Shinju’s event debut comes first.

The story leaves Sajuna at a hopeful point: she has chosen to keep cosplay in her life while also moving forward with her future.

Her role in the narrative remains that of a powerful, beloved guest heroine whose presence, while limited, leaves a strong impression on both characters and readers.