 If you liked
Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e
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 ...then you might like
Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!
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While one is isekai and not fantasy themed and the other highschool classroom themed, both have very similar vibe. Both try but actually don't discuss some philosophy questions. The protagonists fight through strategy against the current antagonists. Both have enough fanservice to sustain the shallower viewer and both are similarly short.