Natsumi Hayama

羽山夏美

Natsumi is Akito's older sister. In the first few episodes she is very mean to her younger brother and blames him for the death of their mother. Later a movie is released with a story quite similar to the Hayama household which is a wake-up call for Natsumi. Later she becomes much nicer to Akito and they start acting like a family again.