Help I'm looking for a game

I'm looking for a game that I found in the past but I can't remember it's name but I still remember some details of it. I think I found it accidentally in youtube ads. It's a game about a sword named girl and I think it's also a strategy game and the voices of the characters are in Japanese. I also remember that it's a strategy role playing game. I hope someone can help me finding this game
 
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