 If you liked
Isekai wa Smartphone to Tomo ni.
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 ...then you might like
Sengoku Night Blood
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Similar situation where MC found him/herself in another world, where he or she now has to use his/her wits to survive. The difference was one is a usual harem while the other is reverse harem, also one world is an afterlife for the guy who is living the life, while the girl in another anime is living in a nightmare.