Tomo Aizawa, a tomboy girl, confesses her love to her childhood friend Kubota Junichirō. However, he mistakes her confession as a casual assurance of friendship between boys, disgruntling her. Later on, Tomo asks her best friend Misuzu Gundo for advice. However, Misuzu says she has rightly portrayed herself as a boy because of her lack of femininity.

After Tomo is groped by an old man on the bus, Junichiro suggests that she stop wearing skirts. Then Tomo meets Carol, an English girl that all the boys in school admire.

Tomo is shocked to learn that Junichiro and Misuzu briefly dated in middle school. Tomo then decides to invite Junichiro out on a date herself, with help from Misuzu and Carol.

Tomo wants to experience some girly interaction, like hugging and hand-holding, so she tries it with all of her girl friends.

Tomo visits each of her best friends' houses. She meets Carol's mom, gets some help studying for midterms at Misuzu's, and... stays overnight at Junichiro's house?!

Junichiro recalls how he and Tomo first met and the four friends spend a day at the beach.

Tomo has noticed that Junichiro is starting to act differently around her. They both try to sort out their feelings while seeing the summer festival fireworks together.