Ayato suffers from an affliction that leaves him unable to experience emotions, turning him into a hollow shell of a man with an empty heart. He cannot feel happiness, sadness, or anger like a typical human being.

"Good morning."

Every day, Ayato donned a mask of outgoing cheerfulness, entering class with a fake smile and greeting others like any regular person. Then, one fateful day, he encountered someone who would profoundly alter his life, awakening emotions within him.