Yume goes missing from the Kuonji household after an argument with her sister Shinra. Ren and Natose go out to search for her, and more is revealed about Natose's past and the reasons for her affection for Ren and Yume. Shinra is revealed not to be as heartless towards as she appears when she returns home. The past of the Kuonji siblings is revealed; they lost their parents at a young age and Shinra decided that she had to be strong (and not cry) in order to keep her family together. This caused the friction between her and the child Yume who thought that because she didn't cry, she didn't care about their parents.