Distant Memories
Season 1, Episode 1 TV-MA
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After the sudden death of their parents, Haruka and his twin sister Sora move to their grandparents' house in a small village they often visited as children. There, Haruka encounters several of the residents, some of whom are old friends, but Sora stays at home, becoming more and more distant, refusing to go to school, even as Haruka starts attending classes.
Akira Embarrassed
Season 1, Episode 2 TV-MA
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Sora 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 and takes her to dry off. Haruka finds Kazuha's phone and goes to return it, only to overhear a conversation with the hint of a secret. Does Haruka misinterpret the relationship?
Indecision
Season 1, Episode 3 TV-MA
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When Kazuha realizes that Haruka has overheard her conversatoin with Akira, she attempts 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 societal standing, Kazuha's father is not able to acknowledge Akira as his daughter, causing Kazuha to be resentful of her father and to feel a burden of guilt and responsibility towards the always-hard-working Akira.
Haruka's Heart
Season 1, Episode 4 TV-MA
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After her collapse from exhaustion, Akira confronts Kazuha about her inappropriate sense of guilt she feels regarding their father's actions. Meeting with Kazuha a few days later, Haruka informs Kazuha that her father had been supporting Akira financially in secret. When Kazuha witnesses her father praising Akira, she realizes that she had misjudged him. She is able to move past her guilt-ridden emotions towards Akira and pursue a whole-hearted romantic relationship with Haruka.
Darkness Revealed
Season 1, Episode 5 TV-MA
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The introduction to this episode replays the event where Haruka overhears Akira's and Kazuha's conversation; but this time, instead of walking away misled, Haruka learns the facts of the relationship and the story has an alternative ending. 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. Is a new romantic relationship in bloom?
i Won't Give Up
Season 1, Episode 6 TV-MA
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Haruka suggests a DNA test to resolve the paternity issues surrounding Akira and Kazuha;and Kazuha agrees. Haruka informs Akira that the DNA results will be out in five days, but Akira disappears on the fifth day. Haruka finds her at the train station, where they talk until the evening. Kazuha's mother appears, and divulges the events as they unfolded many years ago. Akira then reads the DNA results,which confirm that Akira is indeed born of a different mother.
Sinful Maidens
Season 1, Episode 7 TV-MA
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Ryouhei and Haruka are on the school rooftop, peeking at the girls cleaning the pool. Haruka warns Ryouhei not to peek at Nao, and leaves. Much later Ryouhei tells Nao that Haruka has a crush on her; all the while she had been thinking that he did not like her. Something had happened between the two many summers ago and Nao is feeling guilty so many years later. Meanwhile, Sora shows her hatred of Nao, whom she thinks is the reason why Haruka has been preoccupied the past couple of days.
Darkened Sky
Season 1, Episode 8 TV-MA
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By now Sora is showing her hatred of Nao in the open. One afternoon Sora catches Haruka and Nao having a romantic moment in the living room. Sora throws Nao out of the house, warning her not to see Haruka ever again. Nao is desolate after that, and though she wants to see Haruka, she has to hide because Sora is always nearby. However, Haruka is optimistic that Sora will accept them both, as he wants Nao to return to being the cheerful, caring, and lighthearted person he remembers.
Distant Feelings
Season 1, Episode 9 TV-MA
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Nao saves Haruka from drowning and with that event, Sora becomes even more insecure, eventually telling Haruka not to leave home and giving him all sorts of excuses so that he will stay home. On his return from school one afternoon, Haruka finds Sora missing. Finally, after an exhaustive search by the group, Nao finds Sora at the bus stop., Sora reveals to Nao her insecurities with her, that she is afraid Haruka would leave her alone. .
A Bird's Faked Cry
Season 1, Episode 10 TV-MA
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Haruka tries to explain to Sora his relationship with Nao, but Sora is always at the back of his mind. Haruka suggests a date with Nao, but cannot bring himself to tell Sora about it, even going so far as to disguise it as time with his friend Ryouhei. The next day Nao notices that Haruka tries to hide their date from Sora. The relationship is taking a downward turn.
The Uncertain Pair
Season 1, Episode 11 TV-MA
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Haruka takes Nao on a date again, but he cannot get Sora off from his mind. Nao begins to questions his feelings for her. Haruka is unable to explain himself and returns home. Soon after, Sora gets a fever and Haruka stays home to take care of her. Emotions are running high, and Sora is, at last, able to explain her actions and feelings.
Distant Sky
Season 1, Episode 12 TV-MA
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Relationships, both new and old, are questioned and the twins embark on their emotional journey. The twins discover that their parents have left them no money to survive, and that they will have to agree to be taken under the wing of different relatives, causing them to live apart. Days later the two leave for a place overseas, hoping to find happiness elsewhere.