[Crossover] Back to Zero

The past is only the past, and the future holds endless possibilities. The people of the Kiryuu family aren't the only ones with that kind of resolve. Then, in the name of Kiryuu, let's begin a new life. Note: No CP, no CP, no CP. Important things must be said three times. Kiryuu-kun likes busty older women. That's official. If you can't handle the author's unusual ideas, click X.