Mahiro and Mihari are siblings, brother and sister, Mahiro (early 20s) is a shut-in or as he calls himself, a "Home security officer", Mihari (late teens) is a child prodigy, she is an amazing scientist but has never made any of her work public. One morning, Mahiro wakes up to find himself as a girl, and one looking to be younger than his sister. You will be playing as Mahiro