This winter, the Akane couple recently got married. Taking advantage of their daughter's spring break, they decide to go on a family trip to a traditional Japanese inn. The inn is run by someone who has been close to the father-in-law for years. Excited about their first family vacation, mother and daughter can hardly contain their joy. However, the father-in-law has other plans—he intends to teach his daughter-in-law Rino the pleasures of a woman's sexuality, and begins making his move... A story of tangled family bonds and new relationships, portraying the complex emotions of adults.