Wakaba is an adult who is worried about her short height and childlike features. One day, she is tasked with a project for a big company and ends up having to present to a company president, Himeno, a well-known hotel tycoon. The presentation starts well, but she messes up badly at the end. In order to make up for her mistakes, she accidentally tells him that she'll accompany him to bed! "Do you understand what we're going to do?" Even though this is her first time, held by his big arms and loosened up by his intense foreplay, she reaches climax immediately! Slowly, she's tainted by his pleasure. Unlike Wakaba, Himeno is very mature, and there are rumors about him being a big womanizer... Wakaba thinks that she's only one of his many women, but Himeno has other ideas. This is a story about one shrewd man's serious love.