Kouichi Kusano is a Japanese manga artist and writer known for creating romantic comedy and ecchi manga series. His most notable work is Oniichan no Koto Nanka Zenzen Suki Janain Dakara ne—!!, which was adapted into an anime television series in 2011. Kusano is credited as the original creator of this series, handling both the story and the artwork.

The manga Oniichan no Koto Nanka Zenzen Suki Janain Dakara ne—!! began serialization in 2008 and concluded in 2016, spanning a total of twelve volumes. The story revolves around Nao, a junior high school student who has an obsessive crush on her adopted older brother, Shuusuke, leading to a series of comedic and ecchi situations involving multiple love interests. The series was published in Japan by Futabasha under their High Action Comics imprint and was later released in English by Seven Seas Entertainment under the title I Don't Like You at All, Big Brother!!.

Beyond this flagship work, Kusano has been credited as writer and artist for several other manga titles. His earlier works include Renai Complex from 2004 and Renai to Sex to Boku to Kanojo from 2008. He also contributed to anthology series, providing stories and art for K-On! Story Anthology Comic in 2011 and Brother Complex Anthology: Liqueur in 2012. A one-shot manga titled Yu-Ribbon was released in December 2012.

Kusano's artistic identity is closely tied to the ecchi and romantic comedy genres, often featuring themes of sibling relationships and harem dynamics. His work is categorized as seinen, targeting a young adult male audience with content that combines humor, romantic entanglements, and risqué situations. The success of his manga led directly to its anime adaptation, marking his most significant contribution to the broader anime industry as an original creator.