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After the sudden death of their parents, Haru and his twin sister, Sora move to the countryside. There, Haru encounters several of the residents, some of whom are old friends like Nao, but Sora stays at home, refusing to go to school even as Haru starts attending. Realizing that Haru is growing more and more distant, Sora goes to Haru's room at night and appeals to Haru as she removes her clothes.

When Kazuha realizes that Haruka has overheard their conversation, she chases him down to clear up any misunderstanding. She reveals that Akira is, in fact, her illegitimate older sister, born of a different mother. Due to her family's social standing, Kazuha's father is not able to acknowledge Akira as his daughter, causing Kazuha to be resentful of her father.

Sora asks Haru to take her measurements so she can have a uniform made, and finally starts attending school with Haruka, though she is disappointed to find that she and Haruka are in different classes. While cleaning the swimming pool as part of a mixed gym, Akira accidentally soaks Kazuha who forgot her swimsuit, and so Akira takes her to dry off.

On their way home from school, Haruka and Kazuha are interrupted by a frantic Yahiro, who is concerned over the non-appearance of the always-responsible Akira as usual. They discover Akira in her home, collapsed due to exhaustion, and Kazuha proceeds to blame herself and her infatuation with Haruka for not noticing Akira's condition.

Haruka notices that Akira has been acting strange lately, and decides to talk to her alone at school the next morning. He sees the sad look on Akira's face and becomes worried, and wants to help Akira find her mother's pendant (after remembering her losing it as a child). They go in search for the pendant by a tree they would play by as kids, only to Haruka's horror that the tree had been removed by a landslide.

Haruka enters Akira's room and stops her from burning something,[1] which is her grandmother's missing journal, where it is written that Kazuha and Akira has a chance of mistaken identity. With the journal, he suggests to Yahiro and Kazuha a DNA test to prove things once and for all. Yahiro refuses, but, despite disapproval from her mother, Kazuha agrees.

Haruka tries to tell Sora about his relationship with Nao but, Sora says she does not want to talk since she heard the whole thing earlier. Sora wakes up early for school so she could avoid having any sort of contact with Haruka. During lunch, Nao asks Haruka to tell Sora to join them.

The next day Nao comes over to bring Haruka some mosquito repellent, since Sora is scared of mosquitoes, and then leaves almost immediately. The next day Ryouhei invites Haruka to the school rooftop to take a peek at the girls cleaning the pool. Haruka warns Ryouhei, though, not to peek at Nao, and leaves. Much later Ryouhei tells Nao that Haruka, "the prince she has been waiting for," has a crush on her but she thinks he does not like her.

Sora decides to follow everyone at the beach, but at the moment she got off the bus, news that a young man was rescued from drowning unconscious. As Sora looks over, she finds out that the boy in question is Haruka. However, Nao acted quickly and performed mouth-to-mouth resuscitation. With that event, Sora becomes even more insecure, eventually telling Haruka not to leave home and tells all sorts of excuses just to make him stay.

Haruka tells Sora that what they are doing is wrong and that they should stop doing it all, the kissing, all of it has to stop. This leads to a fight between the twins. Sora, being horrified and understandably upset from this, destroys the entire kitchen out of rage. That afternoon Haruka awakens to find Sora missing and her room in a mess.

Haruka takes Nao on a date again, but he cannot shake the sight of Sora masturbating that night off from his mind. Eventually, Haruka hits his limit and tries to get rid of those thoughts by taking Nao to a hotel and attempting to have sex with her, even by forcing himself on her, but she rejects his act and asks if he really loves her. Haruka is unable to answer and returns home.

The next day, Nao and Haru agree to a date on Sunday but Haru forgets that he agreed to go with Sora to shop on the same day. He then lied to Sora and told her that he had plans with Ryouhei even though he was going on a date with Nao. Sora tells Haru to cancel his plans but Haru says he would go with Ryouhei instead. The date does not go well.