Amane Ōguro appears as a high school student and niece of Villa Rosa Sasazuka's landlord, Miki Shiba. Expelled from her family home, she becomes a resident at the villa. Her background involves operating Ohguro-ya, a beachside shop possessing supernatural properties. This establishment can vanish entirely, simultaneously erasing all local memory of its existence. Its appearances and disappearances occur under mysterious circumstances, often accompanied by dense fog when Amane activates its concealment.

Her true nature is Binah, a physical god representing the Earth's version of the Sephirotic Tree. This makes her a distant relative to Alas Ramus, a fragment of Ente Isla's Yesod. As a cosmic entity, she operates under strict rules preventing her from disclosing information not already revealed by her aunt. She wields considerable power over environments, capable of disrupting energy balances and manipulating natural phenomena like fog. Despite her divine status, she maintains an observant, detail-oriented, and rule-abiding demeanor in daily activities, including temporary work at MgRonald's.

Her interactions include guiding Sadao Maou's group through supernatural challenges, enforcing cosmic balance by penalizing disruptions, and occasionally assisting with research. She maintains a distant mentorship role, balancing her hidden cosmic responsibilities with mundane human connections.