Shota bumps into Taizo, an old classmate, and is invited to his house. Once there, he is shocked to learn that Reiko, the girl he used to pine for, is now married to Taizo. Later that evening, Shota accidentally falls down a stairs while pleasuring himself sniffing Reiko's panties. When he comes to, he realizes that the fall has transported him 20 years into the past. Will Shota be able to change time and get together with his dream girl?

Nagi is a diver from a quiet fishing village where a series of strange incidents have been occurring recently, including residents that have gone missing. One day, a stranger takes her to an office where she is asked to recover sunken treasure at Kaijin Reef. Nagi agrees to do so, but during her dive, she gets exposed to strange radiation. Afterwards, she starts to experience moments where she exponentially grows in size. This causes a lot of problems for her and the people surrounding her.