"Inou Battle wa Nichijou-kei no Naka de" centers on a group of high school students who unexpectedly gain supernatural abilities after their school's literature club experiences a mysterious phenomenon. The protagonist, Jurai Andou, develops the power to create and manipulate a black flame, which he names "Dark and Dark." His clubmates also acquire unique abilities: Tomoyo Kanzaki can manipulate time, Hatoko Kushikawa gains elemental control, Chifuyu Himeki can summon creatures from another dimension, and Sayumi Takanashi can nullify any supernatural power. Despite their newfound abilities, the group finds themselves in mundane, everyday situations rather than epic battles, as the title suggests.

The narrative explores the contrast between the extraordinary powers and the ordinary lives of the characters. Jurai, in particular, struggles with the disparity between his expectations of becoming a hero and the lack of opportunities to use his powers meaningfully. The series delves into the dynamics within the group, highlighting their friendships, rivalries, and personal growth. Tomoyo's unrequited feelings for Jurai, Hatoko's cheerful yet complex personality, Chifuyu's childlike innocence, and Sayumi's pragmatic approach to their powers all contribute to the interpersonal drama.

While the story occasionally hints at a larger, more sinister plot involving the origins of their abilities, the focus remains on the characters' daily lives and interactions. The series balances comedic moments with introspective scenes, often using the supernatural elements as metaphors for the characters' struggles and aspirations. The blend of slice-of-life storytelling with light supernatural elements creates a unique tone, emphasizing the characters' humanity over their extraordinary powers. The narrative concludes without fully resolving the mystery behind their abilities, leaving room for interpretation while providing closure to the characters' personal arcs.