Gojou Kouichi

Yuno's older brother who lives alone and attends a university in Tokyo. After losing his girlfriend, he avoids going to the island except during the holidays... because if he doesn't go and visit the place, his sister will complain about it. Though he's a bit tired of Yuno's spoiled personality, he cherishes her dearly. He gets hired by Eri as her part-time assistant, and then gets saved by Komako after a monster attacks him and he sets foot into the forbidden domain.