Yukinari Sasaki, a high school student, suffers from severe gynophobia, a fear of women, due to years of bullying by girls. His life takes an unexpected turn when his childhood friend, Kirie Kojima, moves in with him. One day, Yukinari is mysteriously transported to Seiren, a parallel world inhabited primarily by women. There, he meets Miharu Sena Kanaka, a cheerful and affectionate girl who becomes attached to him. When Yukinari returns to his world, Miharu accidentally follows him, leading to her moving into his home.

As the series progresses, more characters from Seiren enter Yukinari’s life, including Miharu’s protective older sister, Koyomi, and a wealthy, domineering girl named Fukuyama. The interactions between Yukinari and the women from Seiren often result in comedic and chaotic situations, exacerbated by Yukinari’s gynophobia. Despite his fear, Yukinari gradually forms close bonds with the girls, particularly Miharu, who harbors romantic feelings for him.

The narrative explores themes of friendship, trust, and overcoming personal fears, while incorporating elements of fantasy and romance. The series balances lighthearted humor with moments of emotional depth, particularly in Yukinari’s journey to confront his trauma and build meaningful relationships. The dynamic between the characters drives the plot, with each girl bringing her own quirks and challenges to Yukinari’s life. The story concludes with Yukinari’s growth as he learns to navigate his relationships and face his fears, leaving room for further development in the series’ later arcs.