Yui Saikawa is a 14-year-old national idol with a mysterious left eye covered by an eyepatch. Born into a wealthy family and now living without her parents, she is both playful and deeply mature for her age. Her left eye, a family treasure called the "Miracle Sapphire," is wanted by dangerous people, leading Yui to seek protection. Though she dazzles on stage, she hides many secrets and often feels lonely, but gradually finds friends who support her. Over time, Yui faces her past, grows stronger, and remains determined to shine as an idol, no matter how tough life gets.
Yui Saikawa is a 14-year-old middle school girl.
She is always seen with an eyepatch over her left eye.
She usually wears cute and fashionable outfits suitable for an idol.
Her left eye is actually a beautiful artificial sapphire eye, which she sometimes reveals during performances.
Yui is cheerful and playful, often acting as the funny one in a group.
Despite her young age, she comes across as the most mature and reliable person among her friends.
She has a strong sense of responsibility, especially about keeping her left eye safe.
Yui is kind-hearted but sometimes hides her true feelings to protect herself and others.
She is very hard-working, doing her best on stage as an idol and also facing many challenges in her life.
Yui was born in Japan on December 23, 2003.
Her parents have already passed away, so she lives alone in a grand mansion.
Her left eye was blind from birth. When she was 8, her parents gifted her a special artificial sapphire eye, the "Miracle Sapphire."
After losing her parents in an accident at age 11, the left eye became her most precious possession and a way to connect with their memory.
Despite being spoiled by her father and able to drive a cruise ship at 8, she cannot ride a bicycle.
Yui’s left eye allows her to see through objects, a power linked to her artificial sapphire eye.
She can use this power to read people’s movements and even predict their actions.
It also helps her with difficult tasks like piloting boats or planes.
After some training, she can detect if someone is lying or telling the truth.
She protects herself with her microphone and a pistol.
Her parents were the people she loved the most, and she treasures their memory.
She becomes close friends and allies with Kimihiko Kimizuka and Nagisa Natsunagi, who help protect her and her precious left eye.
She later teams up with Charlotte Arisaka Anderson and other new friends.
Many people around her are fans, including her own bodyguards who often prioritize her concerts over security duties.
Yui is known as the "World’s cutest idol" and calls herself "Yui-nyan."
Her fans also call her "Yui-nyan" with love.
She made her debut as an idol in sixth grade and quickly became a top-selling artist.
Yui’s songs are famous for their catchy melodies and wild, funny lyrics, giving fans a special and addictive kind of enjoyment.
Song titles include "Raspberry × Grizzly," "Nine-Star Express Emergency Stop!," "Sapphire☆Phantasm," "Kimi Iro Gimmick," and "Dreaming=Future."
Kimihiko Kimizuka secretly joined her fan club.
- "I’m the world’s cutest idol, Yui Saikawa!"
- "Is that for self-defense?"
- "I already know the truth... I know that you’re not my enemies. But how can I protect my left eye? After my parents are gone... to live in the darkness, I need this left eye."
- "Please listen to this next song. The title is—"
The Idol with a Secret
Yui asks Kimihiko Kimizuka and Nagisa Natsunagi to protect the Miracle Sapphire, her family’s treasure, after receiving a warning that it will be stolen.
She gets help because her house guards are too busy being her fans to do their jobs.
Yui pretends her left eye is just a special artificial eye, but it actually allows her to see through things.
The Attack at the Concert
Kimihiko realizes the real target is Yui’s left eye, not the sapphire.
During a concert, an enemy tries to shoot her left eye with a crossbow, but Kimihiko saves her just in time.
Later, Yui reveals that her left eye is more than just a fake eye—it connects her to her parents and gives her special powers.
She only shows her left eye on stage for a brief moment at the end of certain songs, as a way to honor her parents.
A New Friendship
After a dangerous event, Yui is forced to point a gun at Kimihiko and Nagisa, but with their understanding and support, she opens up about her fears.
Nagisa invites her to become friends and go to the beach together.
Yui hesitates at first, worried she will bring trouble, but Kimihiko reassures her that they can all help each other.
Yui happily accepts and invites everyone on a fancy cruise to the Aegean Sea.
Cruise Ship Crisis
On the cruise, Nagisa is kidnapped by the evil group SPES.
Yui uses her eye power to search the ship, trying to help save Nagisa and the other passengers.
Yui promises to support Kimihiko and tries to be his "left eye" in tough situations.
The group faces many battles together as they continue to stand against SPES.
The Truth about Her Parents
Yui learns her parents were killed by SPES after they tried to help cure her blindness using the power of SPES.
She is offered a chance to get her parents back, but instead of taking it, she chooses to sing and move forward with her own strength.
Yui bravely rejects unhealthy temptations, deciding to live for herself and her friends.
Idol Life and Challenges
As time passes, Yui’s idol career rises even further.
She tries new things like acting and starring in musicals.
Pressure and overwork lead her to lose her voice right before a big event, but with help from her friends, she rests, recovers, and eventually returns to the stage stronger than before.
No matter how busy or troubled she gets, Yui always puts on a smile for her fans and chooses courage over comfort.
Special Training
Yui trains with Bat to better use her left eye's abilities.
During this time, the villain Seed attacks.
Yui and her friends must fight again to protect each other and the things they care about.
Yui’s left eye, once powered by the Seed, kept its X-ray abilities even after the Seed was removed.
With practice, she can now use it for a variety of purposes, from reading people's moves to piloting machines.
She is full of surprises, balancing idol life, secrets, and adventures with her friends.
Yui never gives up, keeping her dreams alive and shining brighter every day.
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