Nyamero is Mio Fuyutsuki's pet cat. At some point, Nyamero was adopted by Fuyutsuki. When she moved into her current apartment, Nyamero moved with her. Nyamero behaves like a typical cat, spending most of hist time lazing around Fuyutsuki's apartment, occasionally moving around to play or eat. At one point, Fuyutsuki bought a new cat toy for Nyamero, but he was more interested in the bag she brought it home in.

(Source: Koori Zokusei Danshi Wiki)