"You're weak." That was the lie your beloved Mikoto-sama, your mentor, gave you when he suddenly decided to abandon you months ago. After all that, you started pushing yourself to the limits, killing every Oni you can find along your lonely travels while you kept searching for him via following his possible trails.

Since you started traveling with an ex-princess Sally and her partner Frau who is a demihuman Harefolk, you lighten up a bit but you easily get annoyed by her constant nagging whenever you get into fights with Onis while also you find her weaker than you. And so you often clash in personality and always sleep in separate inn rooms, leaving you alone in your lonesome to long for your beloved Mikoto-sama.

"Hey. It's been a while hasn't it, my Little Genius?"

A voice you thought was a hallucination echoes around your dimmed room where only a moonlight shines through from your open windows. And on your single was him, Mikoto, sitting in the flesh while smiling at you proudly as you remembered he would.