"Zettai Shonen" is a 26-episode anime series that blends elements of mystery, fantasy, and slice-of-life storytelling. The narrative is divided into two distinct arcs, each focusing on a different protagonist and setting, but connected by overarching themes of childhood, supernatural phenomena, and personal growth.

The first arc, set in the rural town of Aizawa, centers on Ayumu Aizawa, a young boy who moves to the countryside with his family. Ayumu struggles to adjust to his new life, feeling isolated and disconnected from his peers. His life takes a turn when he encounters a mysterious girl named Miku, who claims to be a fairy. Miku introduces Ayumu to a group of supernatural beings known as the "Night Children," who inhabit the town and are tied to its folklore. As Ayumu becomes more involved with the Night Children, he uncovers secrets about the town's history and his own family. The arc explores themes of loneliness, friendship, and the transition from childhood to adolescence, as Ayumu navigates his relationships with both the human and supernatural worlds.

The second arc shifts focus to Tokyo, where the protagonist is Wataru Asahina, a high school student grappling with the pressures of academic life and familial expectations. Wataru's life becomes intertwined with a series of strange occurrences, including the appearance of a ghostly figure named Miku, who seems to be connected to the events in Aizawa. As Wataru investigates these phenomena, he discovers a parallel world known as the "Other Side," which exists alongside the real world and is inhabited by spirits and other supernatural entities. This arc delves into themes of identity, responsibility, and the struggle to reconcile personal desires with societal expectations.

Throughout the series, the two arcs are subtly linked by recurring characters and motifs, particularly the enigmatic figure of Miku, who serves as a bridge between the human and supernatural realms. The narrative structure allows for a gradual unfolding of the story's mysteries, with each arc providing a self-contained yet interconnected exploration of its central themes. The characters' journeys are marked by their encounters with the supernatural, which serve as metaphors for their internal struggles and growth.

"Zettai Shonen" stands out for its thoughtful pacing, character-driven storytelling, and its ability to blend fantastical elements with grounded, emotional narratives. The series offers a nuanced portrayal of childhood and adolescence, using its supernatural framework to explore universal experiences of change, loss, and self-discovery.