Ijiwaru Na Aitsu

Ijiwaru Na Aitsu Manga :

Cute, simple-minded Tomo Masaki has a brother complex, Tomo so adores his older brother Ei that he studied hard to get into Kouryou Academy, where Ei is a popular senior and Student Council President. Now the bane of Tomo's existence is Ei's best friend and Student Council Vice-president, Motoki Izumi. For some reason, Izumi always bullies and teases Tomo whenever he comes to the student council room to pay his brother a visit. Why can't Izumi just stop it and leave him alone? More importantly, why does Tomo's heart pound whenever Izumi does bully him?! Sometimes, Izumi's even nice to Tomo--which only makes his heart beat faster!