Uma Musume: The Horseman's Bizarre Adventure

A story about Johnny and Gyro becoming one with the help of the Three Goddesses and entering the world of Uma Musume for another adventure.

(Uma Musume + JoJo + Stands + one heroine + SBR + some characters turned into girls + near-invincible protagonist + no System + Ripple and Spin + DHP + some characters redeemed + chaotic timeline + original plot + a little horse-mint + slow pace)

(This Johnny is an individual in his own right. His life won't be affected by the fact that he and Gyro became one, and they will separate later in the story.)

Mainly, Johnny has Johnny's appearance, plus horse ears and a horse tail.