The story is about Iridatsu Yuuta, a high school student who lives in an apartment building with 3 girls and a young woman. He has the peculiar problem of becoming excited and gaining superhuman abilities when he sees women's underwear. Also if he sees women's underwear again while in this excited state it also causes him to become overexcited and faint. Further complicating things is that after a bus hijacking incident a spirit possessed his body and left him now as a wandering spirit. He now has to figure out how to regain his body, all while having to avoid getting overexcited and fainting, as for some reason it causes an asteroid to hit the Earth and wipe out all life.
