Ichido wa Kanojo ni Nattemitai!

Seri is a 20-year-old college student who has never been in a romantic relationship. She reconnects with Chihiro, a childhood friend who is two years her junior and currently in high school. Chihiro asks Seri to help her experience things she missed during a period of hospitalization. The two go on a trip together, and during it, Chihiro unexpectedly confesses her feelings to Seri.