(I still can't forget what happened that day. Yes, my father was away on a business trip that day...) When his mother Fumiko tells her to bring soap while she is taking a bath, her son Kenji can't help but stare at his mother naked for the first time since he was a child. "Oh my goodness, what are you thinking (lol)?" Fumiko notices Kenji with a big tent pitched between his legs and teases him, but that night... Kenji becomes obsessed with imagining his mother gently stroking him and indulges in masturbation.