Zettai Fukujuu Meirei
This game is titled Absolute Obedience in North America and Zettai Fukujuu Meirei in Japan.
Successfully complete all missions in a single game with an "A" rank without letting any missions expire. Note: Each character has a secret mission and are unlocked at the same time.
Use the following order to play the missions so that none of them will expire: Louise 4, Kia 6, Kia 2, Kia 3, Kia 5, Louise 5, Kia 1, Louise 6, Kia 4, Louise 1, Louise 3, and Louise 2.
Strategy guides from GameFAQs