Iroha Kira has always loved her older brother since childhood. When she returns home after a long absence, she's shocked to hear him announce he's getting married and moving away. As her brother begins to drift away, Mayu resolves to offer him everything she holds dear if it means staying connected to him. A bittersweet, taboo tale filled with sorrow awaits. The intimacy between them becomes a final, fleeting moment of contact between love and farewell. ...Goodbye, my one and only brother.