Atsushi joins Atsumi and Sayo to a family restaurant.

A game of hide and seek soon turns into a frantic escape from the cops for Atsushi.

Sayo mentions to Atsumi she has always wanted a little sister.

Atsushi and his friends go to Atsumi's school culture festival where he runs into Sayo.

Atsushi wears some clothes handed down from Take, which prove to be a bit controversial.

Sayo learns the truth that Atsushi is Atsumi's little brother.

Atsushi and Atsumi have lunch with Sayo before participating in a relay race.

Atsumi has to act as Atsushi's parent so he can participate in his school's sports festival.

Atsushi, Atsumi and their family go to a hot spring inn where Atsumi's height becomes a bother for her.

As Atsumi ends up making too many snacks for Atsushi and his friends, she invites over Sayo, who continues to misunderstand who Atsushi really is.

Atsushi and Atsumi think about what they want to do in the future.

Atsushi's friends try to teach him how to ride a bike without training wheels.

As a new school year starts, both Atsushi and Atsumi face misunderstandings with the new batch of students.