my friend is trying to remember the title of this anime he watched when he was younger (he is 20 now).
The description from his vague recollection was:
It was about a group of people who (maybe, hes not sure anymore) were dead, however they were still in the real world and solving mysteries. He remembers that in one of the episodes, a famous popstar died and her mom signed a contract to bring her back, and she came back as a vampire...
Also there was a talking animal (like a penguin maybe)?
Thats what he says atleast. Does someone have any idea what this Anime might be? Thank you!