Would be cool if the author would pull a 180 and make the main character end up with Mei instead because it's complete bullocks how Jirou is inconsiderate to both girls that like him.
To be honest this story doesn't feel like a love story, it's more about sexual awareness and sexual attraction created by raging hormones. At this point I think that Jirou never actually liked his childhood friend and all her antics are actually delusions because of her liking Jirou.
You can really see it, when it comes to taking action he's a wuss until his hormones take over, giving the female counterpart false hopes.
What's worse is that he lacks dedication, with his hormones readying him to jump any girl that comes onto him, making him the anti-thesis of the typical harem character.
What I fear is that this ends up like another famous story with a similar setting and a similar main character, "Good Ending", which makes you curse all the time spent on reading that horrible and psychopathic mess developed from a seemingly good one-shot.