Tatsuo, a bicycle messenger, has a mysterious ability the allows him to regularly enter a mysterious room with the words "a-ku-a" engraved on it. One day, Tatsuo meets Satoko, a woman with dead eyes, and falls in love. Satoko spends every Monday meeting her lover and other days like a shell. After being caught peeping into Satoko's room who was having sex at the time, Tatsuo is beaten up. But in a twist of fate, Satoko also acquires the same ability to enter the mysterious room and appeared before Tatsuo...Edit Translation