Ryūji Takasu is discontent about how his eyes make him look like an intimidating delinquent. He wants to get closer to a girl he likes, Kushieda Minori, but has not been able to tell her his feelings. On the first day of his second year of high school, he runs into a diminutive girl, Taigā Aisaka, known for snapping at others and her outward brutality. By coincidence, Taigā and Minori are in Ryūji's class this year. Taigā accidentally puts a love letter in Ryūji's bag, mistaking his for his friend Yūsaku's; Taigā then comes to Ryūji's house that night to kill him for knowing that she likes Yūsaku. Taigā discovers that Ryūji likes Minori, who is also Taigā's good friend, and Ryūji tells her that he will do anything to help her with Yūsaku. Ryūji finds out the next morning that Taigā is already living in an apartment building right next door to his house. When he comes over, he cleans the kitchen and serves her food.