I just finished the latest chapters, and the main plot revolves around a man who finds a woman living in his apartment, claiming she's his 'thing.' That's the literal translation of 'she is mine' from the Japanese title. It's framed as a psychological suspense rom-com. He has no memory of her, but she knows intimate details about his life and insists they have a deep, possessive bond. The tension comes from figuring out if she's a stalker, a ghost from his past, or something tied to a supernatural contract he forgot.
Honestly, the 'plot' feels secondary to the mood. It's less about a linear mystery and more about the unsettling, claustrophobic atmosphere of this shared, confined space. The real hook is the dynamic—her serene, all-knowing certainty versus his growing paranoia and the slow erosion of his grasp on reality. Is she a threat or a salvation? The manga plays with that ambiguity in every conversation.