Dekakute Ecchi na Ore no Ane – My big and horny sisters – デカくてHな俺の姉 – 크고 야한 내 누나 – Based on the erotic game by Marine. After a long absence, Shunsuke returns home at the invitation of his older sisters. He learns that his sisters suffer from a rare condition: they have abnormally strong sexual desires resulting from a disease. Now, Shunsuke must do whatever he can to improve their health.