What had originally started off as a brief detour to another world for a box of chocolates had left Y/N with a job training Horse girls. In between him and his wife's adventures across the multiverse, he stops back in for a few years to train his Uma's. This is a log of the odd scenarios that seem to follow him while training his Uma's.

At Tracen Academy, greatness isn't rare. But monsters? That's something else entirely. You weren't assigned to train a team. You were assigned to survive one. A group made up of legends, prodigies, and absolute anomalies-each one capable of dominating the track alone, each one too powerful, too prideful, or too broken to be guided in any normal way. They don't need a Trainer. They need someone who can keep them from tearing everything apart. From the suffocating pressure of Symboli Rudolf, whose calm authority hides an iron will that demands perfection... To the overwhelming presence of Narita Brian, a lone wolf who runs like nothing else matters-and maybe nothing does... Then there's Orfevre, a self-proclaimed queen who sees the world as something to conquer, not share... And Gentildonna, a ruthless believer in strength above all, whose idea of "training" might leave you questioning who's really in charge... Watching everything with quiet, calculating eyes, Almond Eye stands apart-calm, observant, and far more dangerous than she seems... And then... There's Deep Impact. Silent. Untouchable. The standard itself. She doesn't need guidance. She barely acknowledges your existence. To her, you're not a Trainer. Just someone who writes things down. In a place where egos clash like storms and every step could turn into a battlefield, your role becomes clear: Not to lead. Not to command. But to endure. Because in a group where everyone is a king, a queen, or something far beyond- The real question isn't who will win. It's who will break first.

America does not protect its Umamusume. It disciplines them. Halo has never debuted. She has never stood beneath stadium lights. But four trainers have already left on stretchers. She reacts to restraint with violence. She kills birds when they fly too close. She has learned that hands reaching for her mean pain. So she strikes first. Now she wears a shock collar. And the remote has been placed in the hands of a boy who looks like he could collapse if the wind blows too hard. Y/N is weak. Sick. Outmatched. They told him to use the button. They told him she would destroy him. They told him not to hesitate. Halo is ready to run. Ready to hurt. Ready to prove that kindness is just another lie before the shock hits. But he does not press the trigger. And she does not know what to do with that. This is not redemption. This is what happens when violence is no longer met with violence.

The golden age of racing was supposed to be over. The champions who once shook the world had grown older. Their victories became stories, their rivalries became legends, and their names were passed down to a new generation expected to become even greater than the one before them. But being born beneath a legend does not guarantee a happy life. Set during the 2010s, Umamusume: Generation Next follows the life of Y/N L/N, a young boy growing up in a world where the expectations placed upon him were decided long before he could choose his own future. To the public, he was part of the next generation. A child surrounded by famous racers, powerful families, rising prodigies, and the lingering influence of Trainer Y/N Hayakawa. Wherever he went, people looked at his name, his blood, and the people connected to him before they ever looked at who he truly was. But Y/N never wanted to become someone else's replacement. He wanted a life of his own. From his childhood friendships and earliest dreams to the painful responsibilities forced upon him, Y/N's story is one of growing up beside girls who were born to run. Some would become champions. Some would be crushed beneath expectations. Some would love him. Some would hurt him. And some would disappear from his life before he could tell them everything he wished he had said. As the racing world enters a new era, Y/N finds himself standing between the legends of the past and the uncertain future waiting ahead. He will witness victories that change history. He will suffer losses no child should be forced to understand. He will become a brother, a friend, a rival, and eventually someone others depend on, even when he can barely hold himself together. Because this is not only the story of the next generation of Umamusume. This is the story of the boy who grew up alongside them. The story of Y/N L/N. And the long, painful road that shaped him into the person he would one day become.

Ten years after the age of legends, the world of racing has moved on-at least on the surface. In 2030, victories are measured by data, legacies are dissected by media, and expectations are placed long before a runner ever steps onto the track. The past still exists, but it no longer inspires hope-only comparison. Y/N Kei is a trainer with no history, no known background, and no ties to the racing world. He appears quietly, registers legally, and takes charge of a small, fractured roster-some burdened by family expectations, others completely free of them. Among them are siblings born from a name the world refuses to forget, and others who run simply because they want to.

Tracen Academy is in shortage of trainers, thus they look further a field for new faces to help their Uma's debut, That's where you Come in Y/N L/N a Young track and field runner straight out of college, A determined kid with grit and a heart of gold.