The House of Sin and Blood.

After divorcing her husband after he murdered the woman he was having an affair with, Reimi returns to her hometown and her family home. Her younger sister Mitsuki is missing, her father has passed away, and she lives alone in the house, with only her aunt as her only relative. Her former boyfriend, Tatsuo, is dating Kanna, a hostess, but he persistently pressures Reimi to get back together with him. Meanwhile, her estranged father's twin brother, Kazuo, appears in town. Reimi suspects that there may be some connection between her sister's disappearance and Kazuo's appearance... (R15+ version premiered at the OP PICTURES+ Festival 2025).