Carnal Awakening With Revived Memories – Michiru Kujo.

Keisuke's cousin Takuya lost three years of memory in an accident. Takuya asks for a chance to regain his memory, and wants to stay at Keisuke's house, who he used to visit often, for a few days. Unfortunately, Keisuke was away on a business trip, but Keisuke's wife, Miho, who knew Takuya well and was concerned about the aftereffects of the accident, welcomed him in. As Takuya spends time with Miho, fragments of his memory come back to life. ...And he remembered that he once proposed to Miho.