MonsterZ MATE (モンスターズメイト) is a musical duo of Virtual YouTubers consisting of Kosaka (コーサカ) and Anjo (アンジョー). They make content in Japanese. Anjo and Kosaka are both almost shameless and are heavy otaku, over 80% of their videos are in a way or another, anime, gaming, or manga related. There is an entire video of them talking about the pattern in visual novel/ero game, thus earning them their nickname.