AlterZaelum

[Warning: The story includes races that the protagonists will lose. Please keep that in mind before reading.] After working himself to death and collapsing during a late-night run, Kai finds himself transported to the world of Uma Musume, where he becomes a rookie trainer. The Uma Musume of this world inherit the souls of legendary racehorses from Earth, yet its understanding of training and competitive racing remains woefully outdated. Countless trainers obsess over grueling workloads and brute-force Guts training, causing many talented Uma Musume to squander their entire careers. Fortunately, Kai possesses extensive knowledge of horse racing and athletic training from Earth. He also awakens a development system and happens to encounter Rice Shower, a struggling rookie who has lost her way after suffering defeat. And so, he asks her a simple question: “Will you let me become your trainer?” From the timid, insecure Rice Shower to the self-destructive Gold City, the chronically ill K.S. Miracle, the eccentric Agnes Tachyon, and the ghostlike Manhattan Cafe... One after another, troubled Uma Musume burdened by flaws and dismissed by everyone else gather around Kai. Together, they begin winning the most prestigious races through one miracle after another. Gradually, Kai earns countless titles: “The Triple Crown Trainer.” “The G1 Master.” “The Difficult Temperament Specialist.” “The Miracle Comeback Expert.” “The Driving Force Behind Racing Reform.” “The God of International Racing.” Years later, when Kai looks back on his legendary career, a reporter asks him the secret behind his success. He has only one answer: “Science-based training, and Uma Musume are freaking awesome!” [No weird copypasta] [Features both racing and character interactions] [Characters remain faithful to their established personalities] [Certain elements of the setting have been adjusted] [This is not an undefeated wish-fulfillment story] [The system serves only as a supporting tool and will not overshadow the story] If all of that sounds good to you, then welcome aboard. Thank you for your support!

An unexpected trip to the Naruto world, and I’m already doomed to die at fifteen! Just as despair sets in, Yashiro unlocks a card-drawing system. All he has to do is accumulate Fate Points to draw cards! Perfect! Wood Release, the Sharingan, the Nine-Tails... Let me pull! Except something seems to be wrong with this system. Why is everything he draws from the world of Jujutsu Kaisen? Wait... You mean I get to use Jujutsu Kaisen’s mechanics with Naruto’s raw stats? “In that case, let’s try a shot of [Mutually Multiplying Explosive Purple] and see what happens.” “You’ve got to be kidding!” [Multi Shadow Clone Jutsu: Dismantle]! [Gentle Fist: Eight Trigrams One Hundred Twenty-Eight Palms, Black Flash]! “YOU’VE GOT TO BE KIDDING!!!” [Idle Death Gamble: Eight Inner Gates, Gate of Death, Open]! “For the next four minutes and eleven seconds, I’ll be spamming Night Guy.” “You’re lying! There’s no such jutsu!” “You’re just scared.”