Reiko is too good for that trashy protagonist. Why can't she see that?
Probably the incessent bullying from the others lowering her self-esteem.
Actually more likely that he is the only named male in the entire school the author bothered to put in this story. This pseudo-harem stuff really is awful.
@ShiroAurora : Nah. Plenty (rightly) like Reiko-chan. But the Worst Girl (Chiaki) fans are noisy nuisances who like picking on Best Girl... much like the one they're fixated on.