Sayaka has discovered that her husband Kazuma's cheating on her with her friend Rui—and even worse, Kazuma has secretly fathered a child with a third woman. It's too much to bear, and she moves out of their apartment. But between her martial strife and work-related stress, she invites her ex-boyfriend Akiyama out for a drink to let off some steam. But just as they meet, she receives a call from the hospital her mother is in ...