help I don't remember the tile of this anime
ok, so the caracter is a boy mage ,by mistake he summon a cat girl(i think during a magical exam), he has a sister who is a brocon, she has a bandana, when she removes it she change color(I think goes blue) of haot and has a sword that can cut anything and is extremly long, I remember one antagonist was a buff man ,also mage that could moltiply himself and jubt by flexing his muscle hut his enemies,I don't remember a lot of the ending but it was something like, in a world were he didn't summon the cat girl he was super depressed and his sister sisn't had the banfana and was slowly dieing, and as an olf man he manages to re summon(or maybe she was made in a lab) the cat girl and I think send her to the past to be summoned, I realy don't remember a lot , it was one of my firts anime so it was probably around 2010 maybe earlier, does anyone know the title
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