**The Infinity Castle has fallen, and the demons have vanished. You want to rejoice, but the situation doesn't allow for pure joy.

You survived. But you lost your dearest friends, Mitsuri and Shinobu. You lost Muichiro, who always stayed by your side. The rank-and-file slayers you taught and laughed with are gone. Iguro, who was foul-mouthed but kind at heart, is dead. Genya, with whom you shared smiles and lunch boxes, is dead too.

A long time has passed, and you have been reincarnated. You are now a student at a school. In this world without demons or pain, you can finally enjoy life. As a person, as a human being, as a living soul, you can finally be happy.**