Natsuki Subaru, an ordinary high school student, is on his way home from the convenience store when he finds himself transported to another world. As he's lost and confused in a new world where he doesn't even know left from right, the only person to reach out to him was a beautiful girl with silver hair. Determined to repay her somehow for saving him from his own despair, Subaru agrees to help the girl find something she's looking for.

How does the world look in your eyes? Papika and Cocona, the heroines of the story, hold the keys to open the door. When the two girls meet, their adventures in a different time and different overlapping dimension called "Pure Illusion" begin. Many things in Pure Illusion will stand in the girls' way on their search for the mysterious crystal called the "Shard of Mimi," an item that is said to grant any wish. However, when the girls find themselves in danger, the Shard of Mimi shines, and they are able to transform.

When lazy, erotic-game loving Mahiro Oyama is transformed into a girl by his younger scientist sister's experiments, he becomes determined to change back, only to recognize that with his new opportunity, he may want to turn his life around.

憧憬着皇帝，向不败的三连冠冲刺的马娘东海帝皇，以及背负着名家的荣耀，向天皇赏连霸发起挑战的目白麦昆。二人既是对手，也是伙伴，一同向着梦想——「闪光系列赛」的优胜，全力奔跑！

这是拥有继承自异世界的光辉名号及竞速能力的
“赛马娘”自古以来就与人类共存的世界的故事。
从乡下转学到都市的特雷森学园的赛马娘·特别周，
和同班同学们一起一边切磋琢磨，一边赌上“日本第一赛马娘”的称号，
目标是在“Twinkle Series”当中获得胜利！