The Demon Lord Is My Childhood Sweetheart

A girl with no memories sets out on a perilous journey to find a cure. Luckily, a divine miracle drops her right back at her sect. It doesn't matter if she's forgotten everything about her past. Even if her three childhood friends include one arrogant type, one schemer, and one who does nothing but read novels, they're still the best cheats she could ask for. But why was she the one who made herself lose her memory?! And why did no one tell her that one of her childhood friends is secretly the top Boss from three thousand years ago?!