Одзи Косака

Юкитэру's classmate from his old school who transferred with him to the new school. Initially, he saw Yukiteru as a complete failure, but after Yukiteru saved everyone with the power of his predictions, he also became his friend. After Yuno kidnapped Yukiteru in order to keep him in a safe place until the end of the game, he and his friends set out to rescue Amano. Ooishi became the owner of the eighth diary of the future, the "Royal Diary of Kosaki," which described the brilliant moments of his life. On Aru's advice, this diary was broken by Yukiteru in order to block the transmission of data to the owner of the main eighth diary. After connecting the eighth diary of the future to a supercomputer, Ooishi received the "New Royal Diary of Kosaki," this time describing the brilliant moments of the lives of the people around him. He was killed by Yukiteru.