You fall in love with a ghost trapped in glass, and the show spends three episodes making you understand why that love is beautiful and horrifying at the same time. Eiri doesn't just see her, he becomes obsessed with freeing her, but every act of devotion pulls him deeper into her past, until you can't tell if he's saving her or if she's consuming him. The art direction turns a single antique glass into the entire world, rotating and reflecting his obsession back at him until the boundary between romantic and parasitic dissolves completely.
Eiri stumbles upon an antique glass at the cluttered shop where he works, and within its reflection, he witnesses something impossible: a girl moving through scenes of her own life, trapped behind the transparent surface. Night after night, he finds himself drawn to her, desperate to understand what he's seeing. When midnight comes and the boundary between worlds grows thin, contact finally becomes possible. She introduces herself as Cossette, an eighteenth-century noblewoman whose life ended in violence at the hands of her own betrothed, the artist Marcelo Orlando. Her spirit remains imprisoned in the glass, bound by the crime committed against her. Cossette offers Eiri a path forward, though the cost runs deep: someone must willingly shoulder the weight of Marcelo's sins to break her curse. As Eiri considers this burden, the line between obsession and genuine connection blurs. Fragments of the past leak into his present, and the nature of his feelings for a ghost becomes increasingly uncertain. What began as fascination morphs into something darker and more complicated.