This is a lighthearted school sex drama with happy ending written all over it. Matsui will end up with Morikawa, but not before she gets run through by half of the school. Thats fine tho, because he's gonna get some too.
Unless he's gonna get left behind and Morikawa stays in the sex club. But I don't think so, there isn't a serious vibe coming from this work like it was the case in Chitose.