Mayumi Ōhashi (大橋真弓, Ōhashi Mayumi, born March 24, 1966), better known by her pen name Kei Kusunoki (楠 桂, Kusunoki Kei), is a Japanese manga artist known for her horror and comedy manga series.
Her notable works include Yagami-kun's Family Affairs, Ogre Slayer, and Girls Saurus.
Kusunoki was born on 24 March 1966 in Iwakura, Aichi Prefecture.
Kusunoki has collaborated with her twin sister Kaoru Ōhashi, who also works as a manga artist.
She debuted as a manga artist in 1982 in Ribon Original with Nanika ga Kanojo Tōri Tsuita?.