Hiding her past as a former delinquent and living as an honor student, Torako Koshi encounters a mysterious girl with horns hanging from a telephone pole. This mysterious girl, Noko Shikanoko, becomes the source of turmoil that disrupts Torako's life.

Koshitan decorated the Deer Club room to turn it into a paradise. However, the room was vandalized, and Nokotan's life was threatened. It was discovered that the culprit was Koshitan's sister, Anko, driven by her obsessive jealousy due to her sister complex!

With the arrival of spring, new students enroll at Hinominami High School. Among them, a prospective member appears in the Deer Club expressing a desire to "become a deer"...!? Additionally, Koshitan's younger sister, Anko, also joins the club, adding to the chaos. What will become of the Deer Club?

Koshitan serves as the president of the Hinominami High School Student Council. The council also includes Nekoyamada Neko as vice president, Tanukikouji Kinu as secretary, and Tsubameya Chiharu as treasurer. However, one of them is plotting to disband the Deer Club—who could it be?

Koshitan, who is constantly being swung around by Nokotan's whims, decides to follow Nokotan in order to find her weakness. There, she witnesses Nokotan's astonishing part-time job appearance.

As usual, Neko-chan is plotting to shut down the Deer Club. Suddenly, Nokotan shows up in the student council room and pulls out a mysterious creature called 'Tsuchinoko (?).' The more Neko-chan learns about its puzzling nature, the more bewildered she becomes...?