Rinji Amatori

Rinji Amatori (雨取 麟児 Amatori Rinji) is Chika's older brother,and Osamu's former tutor.

Personality
He seemed to be quite caring about Chika, as he explained to Osamu the pain Chika went through after losing her friend.

History
Because Chika had a high Trion level, he was kidnapped by Neighbors.