Daiya Oomine A boy whose wits are as sharp as his tongue. He is willing to deceive and kill in order to achieve his goals. He opposed Kazuki with his box, the Shadow of Sin and Punishment.

Kasumi Mogi A calm and fragile classmate of Kazuki. An unfortunate accident has left her wellchair-bound. She is KAzuki's secret crush and also has feelings for him.

"Thanks for being in charge of me today, Kazu-kun."

"If anything, I'd brag about it."

"... So you're not embarrassed about being with me?"

"Uh, what?"

Kokone Kirino One of Kazuki's classmates: bright, sociable and a little meddlesome. She has been friends since kindergarten with Daiya Oomine.