Wataru Minakami is a top student who failed his high school entrence exam because of a computer glitch . He later discovered that he was accepted to Stargazer Hill Academy, which is located at a mysterious place called Promised Island. At the request of his father, Wataru is whisked away to the island, and before he can settle in, a dozen of cute and charming girls start to flock him and claim to be his younger sisters. As Wataru gets closer to his newfound siblings, a deeper mystery as to why they were sent to the island comes to play.

1. Daisy Bouquet - 4:37
2. A Little Pansy - 4:31
3. Speed - 4:27
4. Girlish - 4:49v 5. Angel's Happiness - 3:58
6. Prayer - 4:55
7. Kiss of Darkness - 5:53
8. Faint Dream - 5:08
9. Secret of Love - 4:01
10. I Check Your Heart! - 3:48
11. Sweet Sour Cherry Pie - 4:21
12. A Prince and Sweet Stars - 2:49
13. Sister Princess: A Letter from Karen - 1:07
14. Sister Princess: A Letter from Kaho - 1:09
15. Sister Princess: A Letter from Mamoru - 1:10
16. Sister Princess: A Letter from Sakuya - 1:06
17. Sister Princess: A Letter from Hinako - 1:06
18. Sister Princess: A Letter from Marie - 1:06
19. Sister Princess: A Letter from Chikage - 1:06
20. Sister Princess: A Letter from Haruka - 1:06
21. Sister Princess: A Letter from Rinrin - 1:08
22. Sister Princess: A Letter from Yotsuba - 1:09
23. Sister Princess: A Letter from Shirayuki - 1:09
24. Sister Princess: A Letter from Aria - 1:11