 If you liked
Jigoku Shoujo
|
 ...then you might like
Btooom!
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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.