
Otoya Takechi is a Serial Killer who terrorized an entire town in fear and is the main antagonist in the episode 3 of the anime Akuma no Riddle and later in the episode 10 become a secondary antagonist. She considered one of the vilest among the assassins of Black Class by the fact that she is one of the antagonists that even after having a chance to go to the side of good being Haru's friend but she refused and continue the killing her for pure sexual pleasure.
The Miracle Elite Storyline[]
Trouble in London[]
According to her title "Jack the Ripper of the 21st Century", she is a daughter of Jack the Ripper and sister of Yandere-chan. Dorian Gray and Sheriff Vaisey too, are bad guys at England society. They welcomed her on their side for a start of mayhem in London.