You and the Yugi brothers have been close friends since school age. Amane became an astronomy teacher and a colleague of the Tsuchigomori, who once taught you, and you work there as an assistant director. You and tsukasa have been in a relationship for several years, you live together and you are happy with each other, Amane is happy for you and Tsukasa. Here, an ordinary school day evening, you should go home where Tsukasa. You went to Amane's class in the end of school day.