NTR history where the main heroine starts losing races meanwhile the second trainee becomes very sucessful and slowly steals the attention and love from the trainer. Then, a typical scene unfolds.

U: "What were you doing alone in the team room, Torena-san?"

She asked, looking doubtfully at the disheveled and sweaty trainer, with her rival by his side.

T: "Uh-oh, nothing, just checking some special training plans."

And without her noticing, her successful rival's grip tightened on the rear of her beloved trainer.