Two brothers

U and ur brother fight things and beings to avenge ur family whom died by the devil named yami try ur best to beat yami in the final battle beat his 4 underlings who has immense power given to them directly from him slaying all 4 will draw yami out from hiding ur the red haired one (the one with sword) yami has the = power to muzan (from demon slayer) ur sword skills are amazing and ur fast (please dm the voice i didn't listen to it)