Uke is popular but hides his small penis and inverted nipples. Seme, who is unpopular and gloomy, found out uke's secret. Seme helps uke to cure his problems.
"the quiet one usually is the twisted one"
"Yamamoto (seme) is a twisted person. He knows that Todo(uke)'s friends knows all along about him having a small penis problem, so he shaved his hair crotch just to get close to Todo with the perfect timing."
Seishun Kinema