Shinya and Mizuki are so close that they know everything about each other, from their love affairs to their propensity, regardless of gender. Mizuki, who is usually strong, quickly collapses at a drinking party with a group of good friends at university, and she decides to stay at Shinya's house. Mizuki's frank talk that it seems that he accidentally had sex with one of his close friends and it seems to have become awkward, but...! ?
