Hi!!! I really need some help here... I was reading a novel were the female MC was a waste, have a family of older brothers and a grandpa that loves her dearly, but she was obligated to hide her gender from infant, leather she is a badass and make a contract with this handsome demon soul, have a six of seven rot (rainbow), a magical space, can learn about alchemy, space arrays, tamemaster (contracted beast), etc. And she have a group of friends that travel with her 3 boys and 1 girl...and she have a perverted spiritual bunny as her main contracted beast...
It seems to me to be this: https://www.novelupdates.com/series/insanely-pampered-wife-divine-doctor-fifth-young-miss/