Osananajimi no Ohime-sama

Childhood promises often fade with time, but for one unassuming young man, a long-forgotten vow to a girl he once knew is about to resurface in the most unexpected way. His quiet, ordinary life is upended when a stunning young woman arrives, claiming to be the princess he swore to protect all those years ago. The only problem? He has absolutely no recollection of this grand declaration or the royal lineage she insists upon. As this self-proclaimed princess integrates herself into his daily routine, chaos and unexpected charm ensue. He's left to navigate a bizarre new reality where fairy tales might just be real, and the girl from his past is far more than he ever imagined. Can he reconcile his mundane present with her fantastical claims, or is he destined for an adventure far grander than he ever dreamed?

✦ AI-drafted summary