Ashina Douma had found a job and returned to his hometown. While swimming at a public pool, a staff member asks him to be a temporary instructor for a swimming class. This swimming class is a memorable class that Douma had been a part of in the past. So, I said yes to her with a simple "yes", there was Harumi Tose my junior at the time, who I used to miss very much. Douma is not too happy when his junior colleague, who he hasn't seen in a long time, makes a strong move on him. When he returns to his parents house, his father's child from second marriage, Shinjo Hamaoka tries to get under his skin. I'm surprised because I thought she was a quiet girl. Moreover, when he goes out from his house, a girl named Nago Natsune waits for him to come out. This girl is also overly skinny, which puzzles Douma. If you ask me, this trio of good friends had formed something called the Ladies Alliance over Douma. The rule is that all three are held by Duoma and then he get to choose one of them... When the three girls confess their love to him, with their dazzling gradations of suntan, Douma is?