Shiki (The OST the theme the characters

)
Nagi no Asukara (I was shocked to know this was not as well known in recommendation)
Ixion Saga DT Great Comedy Isekai.
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Grimgar of Fantasy and Ash: a realistic depiction of the hardships faced by individuals unexpectedly transported to a fantasy realm, compelling them to start from scratch and endure grueling labor to stay alive.
It should have been atleast 24 episiodes I would say to make its mark as main focus is character and their development but after intial few episodes I felt its job was mostly done and they just wanted to promote the novel..
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I guess I have a thing for High Stakes game themes. Will check Danganronpa next.
I would suggest play the danganronpa Games...after that can watch the anime..
Try out, One Outs(this is baseball + insane mind game evven though I don't watch or play or care about baseball this is a great watch) and Kaiji for anime.
There are many mangas with such themes though, like the first one I read was liar Game.