Fuyuhiko is initially incredibly stand-offish and rude to the other students on the island. He claims he's not going to play at being friends with anyone, and when he is questioned about this in Chapter 1, he states clearly that he would not hesitate to kill anyone of the others. When Fuyuhiko does interact with the others (by choice or otherwise), his attitude is combative and irritable. He's easily angered, often threatening and/or insulting other people when they disagree with him.