In the small, quiet town of Iwajima, Kosuke Korugane, an 18-year-old high school student, is initially introverted and skeptical but determined and kind-hearted. Kosuke is a creature of habit, following a typical high school student routine. He wakes up early, attends classes, and spends his afternoons doing homework or participating in extracurricular activities. In his spare time, Kosuke indulges in a few pastimes. He enjoys being outside, going on hikes, and spending time in the neighborhood park.

Kosuke has a supportive family. A sense of warmth and understanding characterizes his relationship with his parents and siblings. Perhaps he has a younger sibling who looks up to him, providing a source of motivation and responsibility.

Despite the appearance of a normal life, Kosuke faces some personal challenges or struggles, such as academic pressures, self-doubt, or a yearning for something more meaningful.

While not overly outgoing, Kosuke has a small but close-knit group of friends at school. They share common interests and are part of the same clubs, creating a supportive social environment for him.

On the eve before his life takes an unexpected turn, Kosuke spends an evening with his close-knit group of friends. They gather at a cozy local cafe, a familiar spot where they've shared countless laughs and secrets.

As they sip their favorite drinks, Yuki, Kosuke's childhood friend suggests a spontaneous outing for the weekend, a hike in the nearby hills. The friends eagerly make plans, savoring the simple joys of their camaraderie. 

As the evening unfolds, the friends create lasting memories, unaware that the next morning will mark the beginning of a journey that transcends the ordinary. Little do they know that the enchanting world awaits, and Kosuke's friendships will become an anchor in the whirlwind of fantastical challenges that lie ahead.

The next morning, Kosuke bids his friends farewell, promising to share the intriguing finds from the old bookstore. He makes his way to the familiar town center, the anticipation of discovering hidden gems bubbling within him.

Upon entering the old bookstore, he loses himself among the shelves, trailing his fingers over spines worn with time. The elderly bookstore owner notices his enthusiasm and recommends a particular book—ancient, mysterious, and practically pulsating with untold secrets.

Intrigued, Kosuke flips through the pages, unknowingly reciting an incantation that bridges the gap between worlds. The air shimmers and the unexpected portal opens before him, beckoning him toward a destiny that will intertwine with the threads of magic and fate.

Kosuke, driven by curiosity and a sense of adventure, steps through the portal, leaving behind the ordinary world he once knew. Little does he realize that the echoes of his friends' laughter and the warmth of their camaraderie will become the guiding light in the labyrinthine journey that awaits him.