Yuichiro's rage is so raw it burns through every generic setup the premise tries to hide behind. Shinoa dismantles his vendetta from the inside out, turning what could have been a straightforward revenge story into something about whether killing the people who destroyed your world actually saves you. The action sequences move with actual weight, and the weapon designs feel lived-in rather than decorated, which grounds the revenge fantasy in something that feels real enough to hurt.

A mysterious virus kills every human over the age of 13, and vampires come out of hiding to take control of the surviving children. They offer protection in return for the children's blood. Yuichiro and Mikaela Hyakuya are taken from their orphanage along with the other children they see as family, and all of them are kept like livestock. Mikaela plans an escape that goes badly wrong, and Yuichiro is the only one who makes it out. The Moon Demon Company, a military unit that hunts vampires in Japan, finds him. Years later he serves in the Japanese Imperial Demon Army, set on killing every vampire to avenge the family he lost. The story is a dark supernatural action drama with a thread of mystery.