Centering on a family of three teenagers in high school all living together who are unsure which two of them are related to each other due to a reference from an old photograph.
Miina runs away, but returns to the school without a word. After Karen talks to her, Miina goes to the train station, where she is reunited with Maiku. Miina reveals why she ran away and she and Maiku confess their feelings for one another. At the end of the episode is is revealed that Miina is the girl in the photo with Maiku, but she is not his sister.