Hitsuji Yamada is a Japanese manga artist and writer, known as the creator of the series The Masterful Cat Is Depressed Again Today. Yamada is credited as the sole author and illustrator of this work, which began as a web comic on the comico platform on October 31, 2017. Following its initial online success, the series began official serialization on Kodansha’s Suiyoubi no Sirius manga section on the Nico Nico Seiga website on August 22, 2018. The manga later also started being published in Kodansha’s Monthly Shōnen Sirius magazine from October 26, 2021.

The first compiled book volume of The Masterful Cat Is Depressed Again Today was released by Kodansha on April 9, 2019. The series has been published in English by Seven Seas Entertainment since September 28, 2021, and has continued with multiple subsequent volumes. The story follows Saku, a disorganized office worker, and her giant, bipedal pet cat Yukichi, who surprisingly takes on the role of a meticulous housekeeper and cook, reversing the traditional pet-owner dynamic. This premise has become the signature work associated with Yamada.

An anime television adaptation of The Masterful Cat Is Depressed Again Today was produced by the studio GoHands. The series aired from July 7, 2023, to September 30, 2023, spanning 13 episodes. In the context of this adaptation, Hitsuji Yamada is credited as the original creator of the manga upon which the anime is based.

Beyond this primary series, Yamada is also the author of another manga titled The Witch is Behind Me (僕の後ろに魔女がいる). However, The Masterful Cat Is Depressed Again Today remains the most prominent and widely recognized work in Yamada’s bibliography. The consistent publication of the manga and its international licensing point to Yamada’s significance as a creator of comedic slice-of-life manga with a fantasy twist, finding an audience both in Japan and globally.