 If you liked
Tate no Yuusha no Nariagari
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 ...then you might like
Death March kara Hajimaru Isekai Kyousoukyoku
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While reading Death March kara Hajimaru Isekai Kyousoukyoku, Tate no Yuusha no Nariagari often came to mind. For one thing, both series make use of a mature protagonist as their narrator, which in turn, presents a more analytical and pragmatic view of their worlds. Then, there’s also the shared themes that can be found throughout both works, such as the means of summoning heroes, heroines, slavery, and game-like skill mechanics. If you’re into your fantasy novels with a slightly more seinen edge, then you certainly can’t go wrong with either.