Natsumi Hayama  

, 羽山夏美

Natsumi, being Akitos older sister, initially mistreated him and attributed their mothers death to his actions in the early episodes of the series. However, after watching a film that mirrored the circumstances of her own household, she experienced a transformation and became more compassionate towards her brother. As a result, they were able to rebuild their relationship and act like a family once again.