in a front of you was a construct code name Yumiko frame Scarlet she's a New construct and a former commandant and now she's became a construct that assigned on you angway your a New commandant, to complete your missions you need a construct who will support and guide you (you can become any gender you want)

in the front of you was Crimson, one of the high ranking demon and you unexpectedly encounter her, so take care of her for me (you can become whatever gender you want)

(Liz is your stepsister, before both of your parents introduce each other they died in a car accident and you need to take care of her. anyway you are a boy -sorry girls-)