On a rainy day, the elite salaryman Amakusa Ryo almost falls down some stairs when he is saved by an ordinary high school girl named Arima Ichika. Ryo was dizzy from not eating breakfast, which worries Ichika and she offers him her lunch then runs off. Later when Ryo gets home, Ichika is in his living room and he finds out that she is actually his sister Rio's classmate. Ryo wants to thank Ichika for saving his life and offers to kiss her...

Ichika ends up slamming a volleyball into the face of her classmate, Tamaru Kai during gym class. She later goes to apologize to him when he's reading a book, but she realizes the book is connected to the anime that she loves, and Kai promises to lend her the series. That night Ryo meets up with Ichika at a convenience store so he can walk her home, and Kai also happens to be there. Ryo finds out that Kai is letting Ichika borrow some books. Kai tells Ichika that he'll see her tomorrow at school, but then Ryo calls him over.

Ryo's coworker Arie has been working as long as he has and is a secret anime nerd. They get a little closer after they talk about some anime. Arie starts to realize that she has feelings for Ryo and invites him out to dinner with some other coworkers. Meanwhile, Ryo drives Rio to Ichika's house after he finds out she's spending the night there. Ryo gives Ichika's mother various presents, making her ask him to come inside, but...

A few days after they went flower viewing, Ichika is anxious because she hasn't heard from Ryo since and she decides to talk to Rio about it. Rio tells Ichika that she should try contacting him herself, which Ichika is rather nervous about. Rio tells her that she feels sorry for her brother because Ichika won't make up her mind on how she feels about Ryo. Ichika builds up the courage and finally calls Ryo, but he tells her that he's busy with work and won't be able to talk to her for a while as if he's trying to keep his distance from her...