Don't Be Mad! is the thirty-first chapter of To LOVE-Ru.
Plot[]
During gym lessons, Rito is exhausted from helping his father with his manga last night because Zastin was absent for the wedding of his relative. Now, the boy should run a marathon and don't feel like it. So to help him with the run, Lala summons one of her inventions: the "Easy-Easy Runner-Kun" (shoes that make the user run incredibly fast). Naturally, it goes wrong, and Rito is sent running into a gym when he lands awkwardly on Saki, who is playing basketball. Saki and her friends then beat Rito up.
In class, during the science lecture with mice, Lala remarks that he doesn't look well, but Rito yells at her, telling her that it is her fault. She tries to cheer him up by using "Berserker DX: Modified Spray Version." However, she sprays it on the mice and gets them riled up. The mice jump into Mio's skirt, and Risa tries to help her. However, the mice become very aggressive and perverted as they begin to bite the students and go up the girls' skirts, causing chaos in the classroom. Rito then yells at Lala for the problem she caused with her items and she should think about his feelings before trying to help him. Lala is very hurt and runs out of the classroom, calling Rito stupid. Rito tries to call her back, but he is hit in the head.
Rito comes home to find Mikan who tells him that Lala isn't back yet. Rito is worried and wonders if he was too harsh on her. In her lab, he notices that the rabbit doll he won for her is in a box labeled "Treasure Box." Rito then runs out remarking how Lala makes him worry.
Meanwhile, Lala sits near the river. Lala talks to Peke about Rito and wonders why he is so harsh to her. She also remembers him saying he has someone in mind already. Just then, Haruna comes up to Lala, and Lala asks if she can stay in her house for the night.