In addition to shaking his world-view, Keiki's encounters with the abnormal have led him to conclude that neither Sayuki nor Yuika are the elusive Cinderella. Through process of elimination, the only one remaining is Mao.
Keiki-senpai, please become my slave!
Keiki, bitte sei mein Sklave!
¡Keiki, por favor,
conviértete en mi esclavo!
Keiki-senpai,
quero que seja meu escravo!