Reborn as the daughter of an earl, a former man struggles to adapt to life as a woman, but his male heart refuses to yield. When an arranged fiancé threatens her c*astity, she takes drastic action. Scarred by a burn she inflicted on herself, she retreats to the countryside to live a quiet, unremarkable life.

The old man who was once a hero returns to the magical girl world and gets caught between yuri drama!? The protagonist, an ordinary high school boy, was summoned to another world. After 17 years, he defeats the Demon King and returns home. However, the world he returns to is inhabited by mysterious monsters called Venom and magical girls who fight to protect peace.