Geto was Gojo's (the strongest sorcerer) ex-best friend. But he fell in depression because he couldn't save a girl Riko Amani from dying and became evil - his aim was now to kill all the non-sorcerors as they were the source of curse energy.
Geto was Gojo's (the strongest sorcerer) ex-best friend. But he fell in depression because he couldn't save a girl Riko Amani from dying and became evil - his aim was now to kill all the non-sorcerors as they were the source of curse energy.