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春休みに江の島を訪れた男子高校生・井川迅と、湘南で高校に通う日比野渚。二人の間に芽生えた友情は、やがて愛へと発展し、お互いの気持ちを確かめ合っていく。しかし、迅の大学卒業を控えた頃、渚は「一緒にいても将来が見えない」と突如別れを告げる。 出会いから13年後、迅は周囲にゲイだと知られることを恐れ、ひっそりと一人で田舎暮らしを送っていた。そこに、6歳の娘・空を連れた渚が突然現れる。「しばらくの間、居候させて欲しい」と言う渚に戸惑いを隠せない迅だったが、いつしか空も懐き、周囲の人々も三人を受け入れていく。そんな中、渚は妻・玲奈との間で離婚と親権の協議をしていることを迅に打ち明ける。ある日、玲奈が空を東京に連れて戻してしまう。落ち込む渚に対して、迅は「渚と空ちゃんと三人で一緒に暮らしたい」と気持ちを伝える。しかし、離婚調停が進んでいく中で、迅たちは、玲奈の弁護士や裁判官から心ない言葉を浴びせられ、自分たちを取り巻く環境に改めて向き合うことになっていく――。

High school student Jin Ikawa visits Enoshima during spring break, where he meets Nagi Hibino, a student attending high school in Shonan. The friendship that blossoms between them soon develops into love, and they begin to affirm their feelings for each other. However, as Jin's university graduation approaches, Nagi suddenly tells him, "I can't see a future for us together," and breaks up with him. Thirteen years after their first meeting, Jin is living quietly alone in the countryside, afraid of being known as gay by those around him. One day, Nagi suddenly reappears, bringing along his 6-year-old daughter, Sora. Jin is bewildered when Nagi asks, "Can we stay with you for a while?" but eventually, Sora grows attached to him, and the people around them begin to accept the three of them. During this time, Nagi confides in Jin that he is in the midst of divorce and custody negotiations with his wife, Rena. One day, Rena takes Sora back to Tokyo. As Nagi sinks into despair, Jin expresses his feelings, saying, "I want the three of us—Nagi, Sora, and me—to live together." However, as the divorce proceedings progress, Jin and Nagi are faced with hurtful words from Rena’s lawyer and the judge, forcing them to confront the reality of the environment surrounding them.

Como estudantes do ensino médio, Shun e Nagisa se encontram e se apaixonam. Na época em que Shun está prestes a se formar na universidade, Nagisa diz a ele que ele não pode ver um futuro com ele. Eles decidem terminar. Anos depois, Shun vive sozinho em uma área rural. Nagisa e sua filha de 6 anos, Sora, aparecem na frente de Shun.