Ryoba Aishi prepared a tea that induces deep sleep to make her rivals fall asleep, then she imprisoned them in the basement, and Ryoba did that because she wanted senpai. The first was Kaguya Wakaizumi, the second was Moeko Rakuyona, the third was Honami Hodoshima, the fourth was Sumiko Tachibana, the fifth was Ritsuko Chikanari, the sixth was Ai Doruyashi, the seventh was Teiko Nabatasai, the eighth was Komako Funakoshi, the ninth was Chigusa Busujima, and lastly the tenth was Sonoko Sakanoue.