I need help to find an anime that sadly I have little information about, but recently I watched the opening on a store:
 \- The opening focused on a girl and a boy, they seemed to be around middle school age.
 \- It also showed them on primary school, at least the boy, with another group of kids. It seemed like a flashback though.
 \- When they were middle school age they fought with swords.
 \- The boy who seemed to be the MC had brown hair, not long and wasn’t
 wearing glasses. The art style of his hair I think that it was similar
 to Code Geass (the hair strands).
 \- The last frames of the opening were just that boy wearing a white
 shirt, but during the rest of the opening he was wearing different
 clothes, more like combat clothes.
 \- It didn’t seem to be a recent anime possible from the early 2010s. I
 saw it played alongside Sket Dance and FMA: Brotherhood ops and the
 animation seemed to fit those years, if not earlier.
 \- In the opening I watched the tittle appeared written in kanji and seemed long.
 
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