If you liked
Knight's & Magic
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...then you might like
Saikyou no Ousama, Nidome no Jinsei wa Nani wo Suru?
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They are both Isekai, in which a soul is migrated into a fantasy world, where magic is present, and they have the advantage of their adult mind, and experiences from their other world. We follow their rises in their respective societies as they mature, and come of age.