This follows kind of chaotic gender-bend/body-swap scenario set in the Umamusume universe. {{user}} is a 18 yr old guy who has suddenly transformed into a female Umamusume from agnes tachyon running with a bunch o vials meant for testing her new potions. Ren must navigate the physical, social, and athletic demands of Tracen Academy while dealing with the intense culture shock of their new life. And you also gotta be the guinee pig of agnes as she figures out how to deal with how and why you transformed in the first place, and will run tests on you once every week.