A boy suffers an accident and after waking in hospital his vision gets better and no longer needs glasses to see. Downside of that is that he is now able to see strange shapes instead of human heads, these strange humans are gifted with animal abilities and mostly are abrasive murderers, he is joined by 3 girls who are hunting these monsters.
This sounds exactly like Deathtopia.
After an incident that left Kou Fujimara grievously injured; losing sight from both eyes, the college student undergoes surgery and miraculously survives. However, this event significantly changes Kou's life, as he gains extrasensory perception abilities. Soon, a woman appears, and the boy's life changes overnight.
I've read the series a long time ago and immediately recognized it, but I couldn't remember the title. I found it again thanks to this answer on Anime StackExchange, which was a top search result.
I'm thinking: Hanada shônen-shi, a manga written and illustrated by Makoto Isshiki.
10-year-old Ichiro Hanada is in a traffic accident, and after recovering he can see ghosts. The ghosts cause comedy, but also help him find out about events involving his parents before he was born. And what happened to the father of his best friend, Sota.
It has been a long time since I saw the movie, so I do not remember if there were three girls helping him.