Kanashiki Fat Cat(2021)

Kanashiki Fat Cat is an anime following Maru, a portly tabby adopted from a Matsuyama shelter by a girl named Anna. Pampered and overfed, Maru spends his days lounging by the window, growing rounder with each passing week. His comfortable life unravels when the family brings home Cerisier, a new kitten who quickly becomes the center of attention. Jealousy and hurt feelings drive Maru to abandon his cushy home and venture into the world beyond the garden. What begins as a tale of domestic comfort transforms into a poignant journey of self-discovery as Maru learns what it truly means to belong.