Hakuri was thrown into the world of Uma Musume and given a System to help the horse girls achieve their dreams. However, he abused his System to turn back time, viewing each lifetime he spent with his Uma as just another "round." Now, karma has caught up to him in a new timeline where every horse girl he once promised to marry and settle down with has become a yandere. Will he survive long enough to achieve what he wants, or will he be captured by the very Uma he promised to marry? I'm Just a TL who is translating this good book the Raws name is 硬核托雷纳只想刷成就！all credit goes to the Original Author

After transmigrating into the Uma Musume world, instead of becoming a trainer, I somehow unlocked the [Horse Girl Treatment System] and ended up as a doctor?! To level up my medical skills and become a legendary healer, Lin Anran activated a system quest-only to find out he had to turn into a horse girl and win races?! And the characters he could transform into were... [Platinum · Centaurea] and [Margaret · Nearl]?! Wait-since when do Pegasus count as horse girls?! But the first leg of the Triple Crown, the Satsuki Sho, was already over-no chance at a perfect Classic Triple Crown now. All or nothing! After transforming into Platinum, he set his sights on the unprecedented [Irregular Triple Crown]! Then, switching to Near Light, he stormed the dirt tracks of the American Triple Crown, charging straight into the Dream Cup to face legends like Secretariat and Man o' War! Between all the winning, his medical career somehow took off too. "Hey... can you promise to treat only me, forever?" "I never enjoyed racing before... but for Dr. Lin..." Lin Anran: "Gahhh, stay away from me!!!"

In a world where only legendary horse girls are born to run, one impossible truth shatters eternity: a male has been born-an Uma Musuko. He is the anomaly that should never exist. He is the storm that will outrun destiny itself. Tomorrow, Tracen Academy opens its gates to the only boy who dares stand at the starting line beside gods. Tradition will scream. Records will burn. Fate will break beneath his hooves. The age of Uma Musume is over. The age of the Uma Musuko begins now.