Tomoka, who lost her husband in an accident three years ago, ends up staying at a love hotel by mistake the night before her son-in-law, Tadashi's first choice university exam. Coupled with the atmosphere of the love hotel, Tadashi can't control his sexual excitement with his mother-in-law who sleeps in the same bed. Tomoka desperately tries to suppress Tadashi's erect penis, but it is gradually overwhelmed by the penis.
