On the way home from a drinking party, my girlfriend's best friend, Fumika, missed the last train and ended up staying over at the house where my girlfriend and I live together. While my girlfriend was asleep right beside us, a drunken Fumika seduced me. I couldn't resist her temptation... The next day, completely unaware of what happened, my girlfriend left for a 4-day trip with her family. Even though we knew it was wrong... the two of us left behind... This is the recorded footage of the four days we spent greedily fucking each other.