The game's final boss, Toyosatomimi no Miko, is based on the legends of Prince Shoutoku, a political figure who lived during the Asuka period in Japan. Most notably, Miko shares the exact same birthday, is stated in supplementary materials to have lived in the world outside Gensokyo, and even shares the ability to understand ten conversations at once.

Miko's identity as Prince Shoutoku is also referenced in the name of her leitmotif, "Shoutoku Legend ~ True Administrator."