Yūta Togashi is a boy who, during junior high, wrestled with chūnibyō—the belief that he possessed supernatural powers and the nickname "Dark Flame Master" that kept him apart from his peers. He longs to start high school with a clean slate, hoping for a normal life among unfamiliar faces and free from the weight of his past. Yet this plan is soon challenged when a delusional classmate enters the picture and takes an interest in him.
That classmate is Rikka Takanashi, a girl whose fixation on her own fantasies draws Yūta into a complex dynamic. While her quirks can be irritating and embarrassing to him, he chooses to listen, understand, and support her. As the story unfolds, the two form a fragile bond built on patience and mutual care, with Yūta gradually accepting the oddities that come with Rikka’s world.
To channel her delusions into a sense of purpose, Rikka creates the Far-East Magical Napping Society – Summer Thereof, a club that becomes the center of their shared life. The group includes the current chūnibyō Sanae Dekomori, the former chūnibyō Shinka Nibutani, and the perpetually sleepy Kumin Tsuyuri. Under Yūta’s guidance, they begin to nurture and maintain the club, balancing everyday school life with the strange rituals and discussions that define their little social circle. The club’s unusual meetings and the residents’ personalities create a blend of humor, warmth, and awkward honesty that threads through their days.
During a summer vacation, Yūta learns that two years earlier, Rikka’s father died unexpectedly from a terminal illness, a loss that intensified her reliance on delusions as a coping mechanism. This revelation deepens the stakes of their journey and pushes the pair toward a quest they pursue together: the search for the Ethereal Horizon—不可視境界線, Fukashi Kyōkaisen—which Rikka believes will lead her to her father. As they embark on this search, her feelings for Yūta grow, and his for her begin to mirror that tenderness, marking a turning point where care and romance begin to intertwine with friendship.
Throughout their pursuit, Yūta’s decision to stay by Rikka’s side—accepting her world, helping her navigate it, and choosing to be part of her life—highlights themes of companionship, resilience, and the cautious beauty of young love. The story moves from a safe, separate plan for a fresh start to a shared path where understanding, support, and quiet affection push two teenagers toward a future neither expected, yet perhaps closer to the truth of who they are together.
