Suwa is a man aged 40, shy, not exactly attractive, who spends a great deal of his time at the computer. One day his wife disappears, taking with her credit cars, passport, and all of the money. She leaves only a mysterious note: "Everyone was moon. I can stand it no longer, good-by."

     He knows little about her, having met her through a meeting that was arranged, soon after which they were married. Suwa has always been true to her, and was happily married in spite of not having had any children. For this reason, he does not wish to involve the police in the case and prefers to look for her on his own.

     He has the assistance of his youngest brother who puts him into contact with a harlot, Yumi. Both get along well and take up residence together. Some time later, they are in a small town on the coast of Japan named Minazuki, that means: "Everyone was moon". And it is there that he holds out hopes of finding his wife.