 If you liked
Magika no Kenshi to Basileus
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 ...then you might like
Rakudai Kishi no Cavalry
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In both mangas, there is an academy people attend where they can practice "sword skills" (swordsmanship). The protagonist of both mangas seemingly has a shrouded past (in Rakudai, some of his past has been leaked). Both protagonists also are surrounded by a group of girls (a harem) who may have feelings of affection for him. There is a "little sister" in both series, who come to see him (part of harem in Rakudai, attacks him in Magika). If you've liked one series, you may enjoy the other.