Yuta Togashi has a problem. He used to be a "chunibyo," one of the thousands of Japanese students so desperate to stand out that they've literally convinced themselves that they have secret knowledge and hidden powers. But now that he's starting high school, he's determined to put aside his delusions and face life head on. The trouble is Rikka Takanashi, his upstairs neighbor, is just a little bit delusional herself. And she knows all about his past indiscretions.

Yuta and Rikka may finally be together, but things haven’t settled down just yet! The arrival of Yuta’s childhood friend, the extra-eccentric Satone Shichimiya, is about to take this couple’s relationship from delusional to downright crazy. Not only is Satone a full-time chunibyo sufferer herself, but now she’s claiming to be Yuta’s one and only soul mate. If Yuta and Rikka want to make their relationship a reality, they’ll have to break through Satone’s fantasies first!