Geto began to consider all non-sorcerers as "monkeys" and regretted having protected them during his time at school. After talking with Yuki Tsukumo, Yu Haibara dying in action and killing 112 people in a village to rescue two girls (Mimiko and Nanako). Geto made the decision to become a curse user. He was expelled from school immediately and was considered the worst of all curse users.