Rin Kurogane has long stopped attending classes, spending most of her time behind the school building, where fights break out almost daily. Despite the bruises and blood on her knuckles, she never complains—nor does she seem to feel pain at all.
Concerned about Rin’s prolonged absence, a teacher asks Airi Shimizu to persuade Rin to return to class, believing that Airi’s calm and well-behaved nature might succeed where authority has failed.
Reluctantly, Airi searches for Rin and finds her in the middle of a brutal fight behind the school building. Even as Rin’s hands are red and bleeding, she shows no sign of injury. Shocked and frightened, Airi rushes in once the fight ends—not to scold, but to gently clean and bandage Rin’s wounds.
That moment changes everything.
Intrigued by Airi’s courage and kindness, Rin agrees to return to school under one condition:
Airi must stay by her side.
Rin begins to openly bully Airi—mocking her, invading her personal space, and dragging her around school. However, unlike others, Rin never truly hurts her. Instead, she fiercely protects Airi from any classmates who attempt to harass or bully her, making it clear that Airi is hers.
As days pass, Airi starts to notice the contradictions in Rin’s behavior: the way Rin silently walks her home, skips fights when Airi is around, and attends class only when Airi is present. Beneath the intimidation lies a desperate need for connection.
Slowly, their relationship shifts—from fear to trust, from forced proximity to genuine affection. Airi becomes the first person to see Rin’s vulnerability, while Rin becomes Airi’s shield against the cruelty of the world.
In a school where violence and hierarchy rule, the two girls learn that healing does not always come from avoiding pain—but from sharing it.
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