Tilea no Nayamigoto: Isekai Jashin Tensei Kitan

Shioda Tetsuya, a thirty-three-year-old unemployed man, suffers from Chuuni Disease and is rejected by his family before dying alone. He is reborn in a fantasy world as a girl named Tilea, living with loving parents and a younger sister. Initially content, Tilea becomes concerned as her sister begins claiming to be one of the Six Demon Generals under Demon King Zorg, a descendant of the Three Great Demons. Believing her sister’s condition is worsening, Tilea tries to help, unaware that her sister’s statements might be true. The story follows her attempts to address what she thinks is her sister’s illness, not realizing her own hidden role, and how her actions lead her toward a confrontation with the Demon King.