Paranoia Agent (2004, Madhouse)

Tsukiko Sagi is a famous mascot designer who designed the popular Maromi. One night after encountering a creepy old lady, she is assaulted. She claims it was a young boy with a bat but no one believes her. Now the hunt is on for Shonen Bat as there is a series of assaults happening. Was about to give up on Satoshi Kon's stories but after Tokyo...