The story has a weak start, a confusing middle, but a well-enough ending. The professor becomes a distasteful character once you've sorted the whole premise.
Akira and Yusanao are both Ozawas. Akira, the plain looking guy but with more social skills helps the good-looking virgin, Yusanao, to get a girlfriend. One night, Akira teaches Yusanao an experience Yusanao couldn't forget and pursued Akira. However, Akira has a complicated past which makes him hesitant to pursue a romantic relationship with anyone.
Sore Wa Isshun No Hikari, Dewanaku