Jigoku Shoujo, Btooom! Recommendations
In both animes, when someone dislikes a person enough to wish that they'd disappear, they turn to some sketchy website and enter the person's name. In Btooom, the hated person is kidnapped and moved onto a stranded island with a bag of bombs and are forced into a game of survival since their lives were deeme dispensable by the people who knew them. In Jigoku Shoujo, the person is sent to hell where they are tortured for eternity because the person who chose them made a contract with the jigoku shoujo to get revenge for them.
Kill. Burn. Deceive. Using any means, push hateful poeple in the hell. Ready to dispose.
Both are incredibly bloodymindedness. Almost similar vibes. Very insane characters.
Ai Enma is a messenger of hell. If She receive instruction, she appears from anywhere in the world.
On the other hand, Ryouta Sakamoto is a man who has miserable past. He can't help but kill someone. For survive.
Both main subjects are definition of kill. What about alive? The answer lies in each shows.
As genres, JS has supernatural chemistry. Btooom! is Sci-fi bomb game.
In addition to that, animation is well done. You can concentrate on the screen with confidence.
TBH, Both are too dangerous