Targeted mother's anus

Yuichi suffers from unforgivable love for his stepmother Saya. Saya, sensing her son's feelings, only allowed him to watch her masturbate, saying, ``If it goes this far...'' However, young Yuichi can't stand it alone and attacks Saya. However, at the same time, his father, who was at home, suddenly started suffering and died. Forty-nine days have passed, and Yuichi continues his relationship with Saya despite feeling guilty about his late father, but an unexpected person calls out to him.