Houyou

Tamaki's parents divorced when she was a child. Her father moved out, taking her brother, Kyousuke, with him. Now 11 years later, Kyousuke has returned for a visit. Because of the stress of the divorce, he has forgotten nearly all of his childhood memories of his mother and sister. Is that why Tamaki has a hard time viewing him as a brother? Or is it his "male aura?"