Looking for a True Fiancee

A three-timing 29 year-old man loses part of his memory after taking a nasty fall at a skating rink. The man, who works as pharmaceutical salesman, then discovers an engagement ring in his briefcase. Later, he comes across 3 different women who all claim to be his girlfriend. To figure out which of the women he planned to marry, he sets up dates with each of them. The choices are:

A perfectionist co-worker (Konishi Manami) who at the same pharmaceutical company.

A light-hearted prostitute (Maki Yoko) who works at one of the shops that the man delivers products to.

An ideal "Yamato nadeshiko" type of woman (Ikewaki Chizuru) who sometimes performs a one-woman puppet shows in the park.