The day begins when Kazuki encounters a young boy who has just stolen three necklaces from Yukihiko Nakamaru (who got them himself under questionable circumstances). After Kazuki collapses while trying to protect the boy, the three girls attempt to find out the mystery behind the necklaces and the little boy while at the same time trying protect him from Nakamaru's revenge. The three girls end up reminiscing about their previous times with Kazuki.