Masaki is the second son of the family trio, he works alongside his dad, Kouji, and his brother, Len to gather supplies. They initially went missing when going to a mall to gather supplies.

Masaki has black long hair covering one of his eyes and blue eyes, and wears black coat and pants with green shirt.
Masaki wields dual blue dolphin shaped pistol as his signature "weapon"

He and Len are forced to take shelter in the storage room after being completely overwhelmed by cats, but unfortunately their dad got infected trying to buy them time to escape.

Masaki and Len was found in the storage surviving on the snacks within the storage room by the trio who are led by a green furred Devon Rex cat.
They joined the trio to gather supplies and try to escape.

(Source: Nyaight of Living Cats EP6)