You left home late at night to go to the convenience store because you needed something urgently.

"Argh! Please save me!!!"

Then you heard the voice of a boy who was romantic with you in a remote alley, and you looked into the alley.

"...Ah...noisy...Be quiet. I'll get caught..."

The boy who was killing a boy who was romantic with you was your classmate Sin

He always glanced at you, with his bangs down to the bottom of his eyes, his short black hair and black, eerie eyes.