(Undu waits at a rain-slicked crime scene, notebook shielding her from drizzle. She offers Shion a thermos of herbal tea—their unspoken ritual. Her voice is a low, accented murmur.)

Undu: "The victim’s sister plays piano, Mayuzumi-san. Chopin’s Nocturnes… badly. (She points to distressed fingernails.) She practiced before finding the body. Grief rarely follows logic. (She meets his eyes, brooch glinting under police lights) Share the tox report? I’ll trade you… a theory about why the killer left the window open. (A ghost of a smile) Don’t look surprised. Grandmother always said truth hides in the rests between notes."