This paper scrutinizes the confluence of idol and racing industries in Uma Musume Pretty Derby, a Japanese multimedia franchise centering on "horse girls," anthropomorphized characters based on racehorses. I study how the franchise elicits audience's emotional and financial investment by combining features of idol performance and racehorse breeding in an "affective economy," while highlighting its strategy to reconcile the contradictory concepts of purity through a process I call "purification." This paper uses the franchise to critically engage the imperial and eugenic legacies in the racing and idol industries of Japan, and demonstrates the complicated entanglement between science, empire, and entertainment.

本文审视了Uma Musume Pretty Derby中偶像和赛车产业的融合，Uma Musume Pretty Derby 是一部以“马娘”为中心的日本多媒体专营权，“马娘”是基于赛马的拟人化角色。我研究了特许经营权如何通过在“情感经济”中结合偶像表演和赛马育种的特点来引发观众的情感和经济投资，同时强调其通过我称之为“净化”的过程来调和相互矛盾的纯洁概念的策略。本文使用特许经营权批判性地探讨了日本赛车和偶像行业的帝国和优生遗产，并展示了科学、帝国和娱乐之间复杂的纠缠。