Kill la scorpion

Rekka or as he used to be called by his clan "The scorpion." was known to be a future overpowering protector, but after his whole clan was killed for trying to stop a megalomaniac from destroying the world he is the only one left. Now he goes to Hinnoji Academy to kidnap the daughter and use her as a ransom to bring peace to his murdered family, that is until he met a girl with black hair, a red bang, and a powerful sword.