Resolved Forget the name

Hello,
Forget the name of an anime where the protagonist cannot die because he has a barrier around him that protects him.
Then he meets a boy who wears an orange tree, from what I remember and he promises him that if he finds a way to kill him in the future, he will kill him.

I also remember that the boy he knows works as in a company where they are dedicated to helping people, and when they meet he is on a mission to find a puppy, but as the dog approaches the protagonist he dies when the barrier appears.

thanks,

 

Trickster: From Edogawa Ranpo's "The Boy Detectives Club"

 

Thanks, for some reason today I remembered the character and couldn't remember what the anime was called. I appreciate it a lot,