"Love, Chunibyo & Other Delusions!" centers on Yuta Togashi, a high school student who once suffered from "chunibyo," a condition where individuals, typically adolescents, believe they possess supernatural powers or secret identities. To escape his embarrassing past, Yuta moves to a new school, hoping for a fresh start. However, his plans are disrupted when he encounters Rikka Takanashi, a girl still deeply entrenched in her own chunibyo delusions. Rikka believes herself to be the "Wielder of the Wicked Eye," a persona she uses to navigate her world.

Yuta reluctantly becomes involved in Rikka's fantastical adventures, which are fueled by her vivid imagination and refusal to confront reality. As their relationship develops, it becomes clear that Rikka's delusions are a coping mechanism for unresolved trauma, particularly the death of her father. Yuta, who once shared similar tendencies, finds himself torn between encouraging Rikka to grow out of her fantasies and respecting her need for escapism.

The series explores themes of adolescence, identity, and the struggle to reconcile imagination with reality. Supporting characters, such as Shinka Nibutani, a former chunibyo sufferer now striving for normalcy, and Kumin Tsuyuri, a laid-back upperclassman, add depth to the narrative. The dynamic between Yuta and Rikka evolves as they navigate their shared experiences, with Yuta gradually helping Rikka confront her past while also re-examining his own feelings about his chunibyo phase.

The story balances humor and emotional depth, blending comedic moments with poignant reflections on growing up. Rikka's elaborate delusions and the group's interactions create a whimsical yet grounded narrative, highlighting the challenges of adolescence and the importance of understanding and acceptance. The series concludes with a focus on personal growth, as the characters learn to embrace their pasts while moving forward in their lives.