This series starts out weird and suggests all sorts of strange perversions. The premise is indeed kind of strange:

Komori Isao wakes up one day to find himself in somebody else's room, but it turns out he's actually somehow in the body of Yoshizaki Mari a girl he has been hopelessly following at night. S/he and a classmate try to figure out what happened as Isao tries to maintain Mari's friendships at school.

However, don't let that stop you from reading on. In the beginning Isao is weak-willed and his behavior is cringeworthy at best, but as he sees the troubles surrounding Mari's life, he can't leave it as is. The mangaka begins to raise questions about identity, gender roles, friendship, and family, which I hope will make the rest of this series a worthy read.