In a world very much like our own, great race horses of the past have a chance to be reborn as "horse girls"—girls with the ears and tails of horses as well as their speed and endurance. The best of these horse girls go to train at Tokyo's Tracen Academy, hopefully moving on to fame and fortune as both racers and idols.
Special Week, a high school horse girl from the countryside, has just transferred to Tracen, and she's determined to fulfill her promise to her mother to become the best horse girl in Japan. On her way to school, she takes a pit stop at the race track and instantly falls in love with Silence Suzuka's style, becoming determined to race on the same team as her.
When a series of animal bodies that rot away after a single night begin appearing in a remote mountain village, Inugami, a detective from Tokyo who specializes in the occult, is called to investigate.
While working the case, he befriends a strange boy who works in the field every day instead of going to school. Shunned by his peers and nicknamed "Dorotabō" after a yokai that lives in the mud, he helps Inugami uncover the truth behind the killings — but supernatural forces are at work, and while Dorotabo is just a nickname, it might not be the only thing about the boy that isn't human.
In the town of Lindworm where monsters and humans coexist, Dr. Glenn runs an exemplary medical clinic for monster girls with his lamia assistant, Sapphee. Whether receiving a marriage proposal by a centaur injured in battle, palpating the injury of a mermaid, or suturing the delicate wounds of a flesh golem, Dr. Glenn performs his job with grace and confidence. But when an unsavory character seeks to steal a harpy egg, how will the unflappable Dr. Glenn respond...?