Eerie Queerie

Which then sets up a lot of the humor of the story. Mitsuo, who is not attracted to guys, finds himself, well, sort of himself/someone else's self, flirting with certain boys and, at one point, is even kissed by a boy ( who is apparently a remarkably good kisser, too.)

Mitsuo himself is a really nice boy and really wants to help the spirits than inhabit him, but sometimes they get a little too enthusiastic and he tries to find ways to exorcise the spirit. As the story goes on there end up to be at least two boys who are interested in Mitsuo, and not just when he is inhabited by a female spirit.

If you can't stand the thought of boys being with boys then this is a series you will want to avoid, but if that type of thing doesn't upset you, then this is a really good series to read. This is one of the few manga that, as soon as I get a new volume I want to read it, it's that good.