The protagonist is a woman in her twenties named Hina-chan. Although she currently has a handsome boyfriend, she will never forget her first love, a boy named Itsuki. Whenever other children teased Hina by calling her ugly, Itsuki would defend her, attempting to cheer her up and improve her mood. Eventually, he and some of his family moved away, leaving Hina heartbroken. Nevertheless, the memory of her first love always brings Hina a sense of nostalgia and inner happiness. Itsuki’s grandmother still resides next door to Hina, maintaining a tenuous connection to him. One day, Hina dreams of Itsuki and feels particularly nostalgic. She is merely mentioning this dream to his grandmother when they are interrupted by the arrival of a stranger—a tall, beautiful woman. Wait a moment… it is Itsuki! Itsuki is not joking; he claims that he is truly a woman on the inside and now dresses accordingly on the outside. Indeed, even though Itsuki now lives as a woman, Hina finds herself falling in love again, regardless of Itsuki’s attire. However, Itsuki identifies as a woman and loves only men. Will Hina end up heartbroken once more?