 If you liked
Kimetsu no Yaiba
|
 ...then you might like
Ore dake Level Up na Ken
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I think I'm the only one who recommends this one. But it's actually pretty reasonable. Both series have simple plots and beautiful graphics. Sungjin-Woo and Tanjiro are both good-natured main characters who fight for their families. They both get stronger day by day and both go out to fight monsters.