Mitsumune is a 16-year-old high school boy who has lived a tough and confusing life because of his past and his family situation. He is gentle, smart, and kind, but can be clumsy and easily lets things slip out of his mouth. He chooses to support Masaki, even when others suspect her, because he truly cares about her. Mitsumune’s childhood trauma, especially losing his twin brother and the way his mother treated him, shapes much of who he is. He faces many struggles, like being targeted in “the Masaki Hunt,” and finally learns to stand up for himself with help from friends and family. Mitsumune's journey is full of tension, self-discovery, and facing fears—especially the strange creatures called Nanaki.
Mitsumune has two noticeable cowlicks sticking up from his head, making his hair look a bit wild.
He is a normal high school boy, and nothing about his build or looks stands out too much.
Mitsumune is gentle, easy-going, and a bit absent-minded.
He is very smart at school but not very confident.
He gets embarrassed easily and has trouble telling others how he feels.
He often acts quickly when he falls in love, but sometimes says things without thinking.
Mitsumune is also loyal and tries to protect those he cares about, even if it means getting into trouble.
Mitsumune is actually a twin, but his brother Tokimune died in an accident when they were young.
His mother never recovered, and began treating Mitsumune as if he was Tokimune.
This made Mitsumune’s life very difficult, as he could never truly be himself.
Because his mother was overprotective, she watched him closely, even checking his messages.
- Mitsumune cares deeply for Masaki and chooses to trust her even when others question her.
- Hayato is Mitsumune’s close friend who tries to protect him, but their friendship goes through tough times.
- His relationship with his parents is strained. His mother mistakes him for his dead brother, but his father later encourages Mitsumune to be himself.
- Mitsumune uses his real name as his online handle.
- His Nanaki—a creature that shows up because of his fears—first appears as a penguin plush toy with his mother’s face, and later it grows to a human size.
- After certain events, his Nanaki becomes tiny and shy, looking almost like a small animal.
- The Nanaki also wears Masaki’s hair accessory, which makes it special.
Secret Pain and Support for Masaki
Mitsumune always keeps an eye on Masaki, especially when others point out strange things she says or does.
He defends her when Yura Mikage accuses her, which makes Mikage suspicious of him.
Twin Brother’s Shadow
Mitsumune’s twin brother, Tokimune, died when they were kids.
His mother became confused and treated Mitsumune as if he was Tokimune, causing him pain and confusion.
Masaki Hunt and the Truth
During the “Masaki Hunt,” Mitsumune and Masaki are kidnapped on a bus.
Hayato tells Mitsumune the truth about how he has been treated, which shocks Mitsumune deeply.
Finding the Real Mitsumune
After all this, Mitsumune wakes up in a hospital bed.
He talks to his father again, who tells Mitsumune he should make his own choices.
With help from Haruomi Kamiyama and after meeting Yottsun again, Mitsumune goes back to Nanaki Village.
Facing Fears and Nanaki
When he returns, Mitsumune is attacked by Hayato’s Nanaki.
He tells Hayato how thankful he is and that he wants to be equals. This changes Hayato’s heart.
Mitsumune’s own Nanaki appears—a big penguin plush toy with his mother’s face.
After returning to reality once, his Nanaki becomes weaker and doesn’t come out as easily.
But new fears about telling Masaki the truth cause Mitsumune to form a new, tiny Nanaki.
A New Tiny Nanaki
This Nanaki is cute, small, and shy, always running away from people.
It carries Masaki’s hair accessory on its back.
Even Mitsumune jokes about how scared and weak his new Nanaki is.
Masaki finds it adorable and is kind to it.
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