Tonari no Kaibutsu-kun

Synopsis

Since most students are still afraid of Haru, Shizuku explains that he should stop constantly glaring at them, which is the reason others avoid him in the first place. Therefore he changes his personality by smiling and even offering others help. The girls at school soon realize that he isn't a bad person and become infatuated with him to the point where he becomes popular, causing Shizuku to feel jealously for the first time. Haru's popularity is short lived when he beats up an upperclassman who was picking on a timid looking girl from Class A, Chizuru Ooshima.

Later on he begins to doubt whether he is doing the right thing by violently standing up for people to which Shizuku says that others will eventually see him as a kind person. Following the start of summer, the group goes for a trip in the mountains and upon returning they meet Haru's brother, Yuzan. Due to Haru's strained brotherly ties, Shizuku deduces that she still has a lot to learn about him. Haru wonders if there is anything he can do for Shizuku since she is always there to save him from his actions, to which she says he can repay her with a date.

(Sources: Wikipedia)