MikeHawkSmall's manga / #Serial killer(2)

Urashima Eiji, a college student, goes to sleep after a fun drinking night with his friends. When he wakes up he discovers a beautiful girl next to him who treats him as if they are in a loving relationship. Later, Age finds out that 4 days have passed since he went out with his crew. What did he do during all that time and why does he have no memory of it?. By confronting that reality, he will be caught in tragedy...

A deformed female human goes out with a pumpkin on her head to kill all those who bullied her in the past after escaping from a mental hospital.