One day Mikuri Tomkazu, an ordinary tenth‑grader, has a dream. In the dream a girl battles with some strange contraption and ends up falling straight into his hands. When he wakes, she is lying in his bed. And this, of course, is only the beginning. The events intensify; girls of all kinds and ages literally rain down on Tomkazu, and if it weren"t for the forced battles, it would probably be paradise.