Wow, I want more!. The relationship between Minami, and Kouhei, the relationship between Kouhei, and Haruka, and even the relationship between Minami, and Haruka, there isn't part of this this story that doesn't intrigue me.
Someone should write an entire harem series based on this premise. A nerdy boy ends up sharing the body, of the rival, of the girl, he has a crush on. The tired jokes could get a new twist. Like the boy geting beat up, for being a pervert, simply because he accidentally took over the body, at the wrong time. Then you have the added bonus of the poor rival girl getting caught up in the mix. It would be funny.