A spin-off to the Japanese drama “M: Ai Subeki Hito ga Ite” centered around Masa's secretary, Himeno Reika.

A woman’s dead body is found in an apartment in Kokubunji, Tokyo. The decayed body seems like a half year has passed since its death and it is damaged by domestic cats that ate the body. The woman's death is thought to be a "lonely death" (someone died naturally without anyone noticing for a long period of time). Detective Ayano has doubts about that conclusion. The cats seemed like they were not house trained, which is odd for domestic cats. Detective Ayano wonders whether the cats were really owned by the dead woman. Detective Ayano then finds Suzuki Yoko’s bankbook in an empty fishbowl. It seems like the dead woman is 36-year-old Yoko.