Aura: Koga Maryuin's Last War

In a world where the line between reality and imagination blurs, a young man finds his carefully constructed ordinary life upended by the sudden appearance of a mysterious girl. Clad in an elaborate fantasy costume, she claims to be a warrior from another realm, locked in a desperate battle against an unseen enemy. He, a self-proclaimed former chuunibyou, wants nothing more than to leave his fantastical past behind and embrace normalcy. Yet, as her fantastical pronouncements begin to intersect with strange occurrences in his mundane world, he's forced to confront the possibility that her delusions might hold a kernel of truth. What begins as an exasperating encounter with a peculiar classmate soon spirals into an adventure far grander and more perilous than he could have ever imagined, challenging his perception of reality and perhaps, reigniting a spark he thought long extinguished.

✦ AI-drafted summary