Shy college student and otaku Miyako lives at home; one spring day, her little sister, Hinata, brings home a new friend she made at elementary school; Miyako is enamored by Hana-chan and desperately tries to make friends with Hana-chan.

Miyako is a shy college student who is also an otaku; one day she happens to meet some angelic grade school kids.

At school, Hinata and the others are told to make an original board game for class, and the theme they choose is nothing other than Mya-nee; Miyako can't hide her anxiety when confronted with a board game designed to help her be less shy.

While playing in the pool that Miyako readied for them in the backyard, Hinata, Hana-chan and Noa-chan discover the unexpected truth that Miyako doesn't like school swimsuits.

Hinata's classmate Koyori-chan is always hoping that people will rely on her, but it never seems to work out that way; Kanon-chan is always there to gently smooth things over for her.

Miyako suddenly says she's going to the university, shocking Hinata and the others; unable to believe that Miyako is really a university student, Hinata and the others tail her; they successfully infiltrate the campus.