Episode 23

One Day, Without a Doubt (必ず、きっと, Kanarazu, Kitto) is the 10th episode of the 2nd season Uma Musume: Pretty Derby anime.

Summary
Around dawn, Tokai takes down the paper that has her goal written on it from the small bulletin board on her bed noting her dreams are over.

At their school, Kita and Sato sit in their classroom, while Kita creates a good luck charm for Tokai. Meanwhile, Team Spica wonder where Tokai has been the past couple of days. Believing the reason to be they team had been exploiting Tokai as their "Leader" by doing the chores around the place. Spe suggests setting up a carrot trail leading from outside Tokai's dorm building leading to the Spica base. However, that is admonished as a ridiculous plan and McQueen plans on racing in place of Tokai, and at that time, Tokai gives her withdrawal letter to Trainer. On the track tracks, Turbo wins her first race in a long time and Symboli is shown to have watched the live feed of it from the Student Council office. Tokai then enters the room and requests to talk a bit. They talk about her resent resignation and Hana eavesdrops on it and amid it receives a call from Trainer inviting her to a drink, to which, she accepts.

Outside of the academy, Tokai sees some horse girls training and noting how she can no longer race, she decides to spend the rest of the day having fun. Although she does have fun, it doesn't resolve any of the bitterness that she feels. Returning to the academy, Kita waits outside of the gates, Kita is seen waiting there. Once Kita spots Tokai, she offers her the good luck charm that she made stating that she hopes that Tokai will one day run again. However, Tokai refuses it and admonishes Kita from following in her foot steps.

Later that night at the bar, Trainer enjoys a drink with Hana and talk about Tokai. Trainer details his desire to have Tokai capable of racing again. The following day, Team Spica is informed of Tokai's withdrawal from the team. Just then, Tokai arrives and packs up her things from her locker. Her team offers to help her recover and retrain her to race, but Tokai kindly declines, and McQueen states to Tokai that she'll race in place of Tokai.

The day of the Tracen Academy Fan Appreciation Day is coming up and preparations for the event are in process while. Amid this, Team Spica set up a special concert about Tokai. By dusk, Tokai's leg cast is shown to have come off and is able to run again. Turbo then approaches Tokai and tries to persuade her to race again, mainly the next race she'll be participating in the All Comers race. On the other hand, the registration for that race has ended and that she's done with racing. Turbo then tearfully runs away while cursing Tokai and vents her frustrations to her Team.

On the day of the Fan Appreciation Day, Tokai tries to announce her retirement from racing during her special concert. It was after spotting Kita in the crowd and Trainer along with everyone in the audience cheer for Tokai to return to racing. At that moment, the tv hung in the back of the stage shows the All Comers race where Turbo manages to win the race. Tokai's teammates and everyone in the audience then cheer for Tokai to make a comeback and she tearfully announces that she will.

Characters

 * Tokai Teio
 * Kitasan Black
 * Satono Diamond
 * Vodka
 * Gold Ship
 * Special Week
 * Daiwa Scarlet
 * Mejiro McQueen
 * Silence Suzuka
 * Trainer
 * Twin Turbo
 * Ikuno Dictus
 * Matikanetannhauser
 * Nice Nature
 * Misato Akasaka
 * Symboli Rudolf
 * Hana Toujou
 * Rice Shower (Mentioned)
 * Air Groove