No matter the time, it's time to get serious──!! When Sojoji Rei and Shimizutani Ryuuka discover that their friend "Nacchan" is actually the nemesis of Eguchi Seira, "Fujishiro Nanami," they find themselves facing a girl cloaked in such "darkness" that she could easily be mistaken for someone else. With a defiant smile, she begins to crush the hearts of her opponents──…