Miho, a married woman from Kansai, reappears in the series of Overnight Stays at a University Student's House. This time, her partner is a black man studying in Japan. They overcome the language barrier with their natural cheerfulness and charm and become close, but she is shocked when she sees the man's penis. Miho is confused by the size of his penis, which she has never seen before, but her reason gradually goes out of control as she experiences pleasure for the first time, and she once again takes off the condom and commits the taboo...