Kitasan Black holds a press conference to announce that she will retire after this year's Japan Cup and Arima Kinen, shocking both her fans and friends who didn't know about her decline in conditioning.

Kitasan Black furiously trains for her last Arima Kinen. Team Spica together works to fulfill her final request for the race. Anticipation builds across Japan as fans realize this will be their last chance to see Kitasan Black run in the Twinkle Series.

Her focus renewed, Kitasan Black's performance in races is improving. She asks Satono Diamond to go on a trip with her. After playing rock-paper-scissors to select their destination, the two go on a long train trip together.

Everyone seems to think Satono Diamond can't win the Kikkashou because of the jinx on Satono horse girls. She decides to face the jinx head-on and prove there's nothing stopping Satono horse girls from winning Triple Crown races.

Kitasan Black is on a winning streak heading into this year's Arima Kinen. Satono Diamond, having "broken" the jinx on Satono horse girls, is determined to win the Arima Kinen next and so prove that she is stronger than Kitasan.

Team Spica is stunned by BNW's outstanding performance at the Japanese Derby. Meanwhile, Tokai Teio is supposed to be focused on making her comeback in the Takarazuka Kinen, but ends up fracturing a bone for the third time. The doctor tells her that even after it heals, there's a chance she'll never get her old speed back again.

No longer able to run at full speed, Tokai Teio realizes that she'll never win again. Left with no reason to race, she plans to withdraw from Team Spica, but Trainer asks her to put on one last show for her fans.

As Tokai Teio continues to train in preparation for her return to racing, Mejiro McQueen notices something strange.

The Arima Kinen is the final G1 race of the year, featuring a roster of horse girls selected by fan ballot. Tokai Teio is among the competitors, and this time, she is running with something to prove.

After many trials and tribulations, it is finally time for Team Spica to race in the Spring Tennoushou. Trainer acknowledges that Mejiro McQueen has the advantage when it comes to long distance, but it's hard to imagine Tokai Teio losing after all the growth she's shown. Come what may, everything will be decided at the finish line.

Kitasan Black resumes training, but she's still troubled by how she felt at the end of the Takarazuka Kinen. She throws herself into practice, but Trainer has started to suspect something about her might have changed.

Seeking three consecutive victories at the Spring Tennoushou, Mejiro McQueen's focus is only interrupted by the sudden withdrawal of Rice Shower, another top racer. Intuiting Mejiro McQueen's feelings on the matter, Tokai Teio tries to persuade Rice Shower to change her mind.

Both Mejiro McQueen and Rice Shower have been practicing hard for the Spring Tennoushou, but the gap between them only grows. Realizing that she has no hope for victory at this rate, Rice Shower disappears right before the race is set to begin.

It’s the second day of a special weekend for Team Spica. Special Week has to carry the dreams of her trainer and herself. The expectations of her rivals, teammates and her mother. It’s finally time for the greatest race in Japan to begin.

Satono Diamond runs in the Japanese Derby, the race coming down to a photo finish. Meanwhile, Kitasan's times are better than ever after her intense training session. But Kitasan's hopes might be dashed by Duramente's recovery...

The Japanese Derby is over, and Tokai Teio's injuries have landed her in rehabilitation. She's determined to recover by the Kikkashou, the last race she needs for the Triple Crown. Meanwhile Nice Nature throws herself into training with the rest of Team Canopus, determined to claim victory at the Kikkashou herself.

After tasting her first defeat, Tokai Teio is listless for days. Finally, Trainer approaches her and tells her that, as Team Spica's leader, there is a place she must visit. Meanwhile, Mihono Bourbon has her attention focused on the upcoming Kikkkashou.

With the Arima Kinen over, Kitasan Black tries to come to terms with the outcome. She tries talking through her feelings with other horse girls, and learns about the dreams that Satono Diamond and Duramente are pursuing.

Team Spica is training to take down Rigil. Special Week realizes she really wants to race with Silence Suzuka, and decides to talk to the Trainer about it...

All eyes are on Tokai Teio as she takes on the Japanese Derby, ready to gallop in Symboli Rudolf's footsteps and become an undefeated Triple Crown Horse Girl. The stands are full. The track is set. It's time to see which horse girl fortune favors!

Kitasan Black is stuck in a losing streak. While talking to Nice Nature, she gets the idea to attempt a more intensive training regimen, since she's not prone to injury. Trainer isn't convinced that's such a good idea...

Special Week starts training even harder to prepare for the Japanese Derby. Her rivals, El Condor Pasa and Seiun Sky, are training hard, as well. Suzuka also tries to help Special Week get even stronger.

Silence Suzuka and Special Week start working hard with Team Spica in order to keep their promises to one another. Rigil is still doing very well in their races, while Grass Wonder looks forward to her race with Special Week.

The Trainer plans a summer training camp for the members of Spica to help get them get in even better shape. He sees Special Week and Silence Suzuka worrying too much about each other, and makes a plan to help them move forward.

The Open Special is overflowing with spectators, and everyone has their eye on the turf, waiting for one horse girl to make her return after about a year.