Shouta Handa, a 25-year-old unemployed man, is sick and bored of his mundane existence. He gets to meet all of the attractive females who used to be his classmates one evening at the class reunion. He quickly realizes that they are all prosperous with intriguing occupations and, more crucially, that they are all incredibly gorgeous now, with larger curves. Unfortunately, it appears that they are all aware of his monotonous, failing existence, so they tease him and brand him a loser, just like they did in the past. Everything changes when Shouta goes for a cigarette and falls into the school swimming pool by mistake. This causes a supernatural occurrence that transports him back in time ten years.