Total Recommendations: 1
If you liked
Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru
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...then you might like
Kage no Jitsuryokusha ni Naritakute!
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Both anime show a super-powered MC in an isekai. The MC is an assassin who uses magic and swords. Both have a harem of waifu who are also assassins.