Also known as: 猫山シエン
Kageyama Shien’s mascot and pet, a Grey Cat with perpetual Jitome Yellow Eyes and fur-trimmed neck who wears a White Necktie. According to the one takeover stream, he speaks in a rather monotone voice, and likes Fish and Hamburger Steak. In Shien's 3D debut, it's revealed that Nekoyama is able to change his size in real life. Created by Aragami Oga.