The Shiunji Family Children

Arata, the eldest son of the Shiunji family, yearns for a girlfriend. One day, he and his six siblings learn a shocking truth from their father.

Ouka is shocked when Shion tells her what Kotono said to Arata. Later, a confused Arata returns to his room only to find Seiha waiting for him.

The siblings head to a theme park to celebrate Kotono's birthday. After the younger ones wander off on their own, Banri asks Arata to accompany her.

Having witnessed Ouka's confession to Arata, Minami isn't sure how to bring it up. She tries asking him if anything happened between them.

Noticing Seiha seems lost in thought, Arata offers to lend an ear. She suggests they play a game of physical skill so she can verify her emotions.

Shaken by Kotono's unexpected declaration, Minami practices for a tennis competition while hiding an ankle injury. Arata offers to help her recover.

Minami comes home, implies to her worried siblings that she won't be competing in the finals, and then goes to her room. Arata decides to talk to her.

Minami starts to see Arata in a different light. Banri asks Arata to sneak onto her nursing school campus with her at night to retrieve something.

When Ouka fails to return from her trip, her siblings use her shared GPS location to discover she is on Mt. Fuji. Arata sets out to find her.

As Arata carries the injured Ouka down the mountain in the pouring rain, she tells him what made her want to reach the summit of Mt. Fuji.