Artist. His topics are usually weird or obscure, similar to the artist sakkan.

Full name: 河野雅夫 (Kouno Masao)

Original series

Masao has created a few different original series.

• Ishida to Asakura
• Kin no Kutsu, Gin no Kutsu
• Yamada-san wa Tottemo Baka Nan Desu

Tracing controversy

Masao has been accused of frequently using unauthorized tracings in his work, including the Young King serialization of Ishida to Asakura.
For more info, see the following:

• Pixipedia article トレス職人☆マサオ (Trace Artisan ☆ Masao)
• 【pixiv】マサオトレパク検証【ヤングキング/石田とあさくら】
• マサオ盗作問題について少年画報社の返答
• http://www4.atwiki.jp/masaopaku/

Revisionism

A great many of Masao's works are revisions of prior works. Uploaders would do well to search for prior works and set the newest as parent (see also: help:post relationships for more)