As Atsushi prepares for a recorder exam, his appearance to others leads him into a tough situation when he tries to talk to one of his classmates.

Atsumi takes Atsushi shopping with her.

Sayo and Atsumi discuss what kind of guys they like.

Atsushi's elementary school teacher, Futami Moriyama, has problems dealing with Atsushi. Later, being with Hina, Atsushi has a run-in with authorities again.

Atsushi has to dress up as demon for the winter solstice bean throwing. Atsushi is proving to be a very good demon, almost too good.

Atsushi receives a lot of chocolate from the other girls on Valentine's Day.

Sayo goes to the movies with Atsumi and Atsushi, unaware that Atsushi is Atsumi's little brother.

Atsushi is invited to Hina's house for Hinamatsuri, but is turned away by her suspicious parents.

Atsushi and Atsumi's neighbour, Take, comes over after breaking up with his girlfriend and quitting his job.

Atsushi gets help from Atsumi to make some gifts for White Day.

Atsushi tries to do his homework at the library, where he encounters Sayo again.

Atsushi faces yet more misunderstandings with the police.

Atsushi and Atsumi stumble upon a Ms. Moriyama, who is very drunk; she takes this opportunity to express some feelings with Atsushi

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

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

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

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

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

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

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

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

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

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

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