Little sweet girl named Rin-chan and her secret book of recipes for cookies, desserts, and some other treats relevant to the different plotline of each chapter.

In the Mizu Wakusei Nendaiki (Aqua Planet Chronicle) series:
1. Mizu Wakusei Nendaiki (Aqua Planet Chronicle)
2. Zoku Mizu Wakusei Nendaiki (Aqua Planet Chronicle After)
3. Kan Mizu Wakusei Nendaiki (Aqua Planet Chronicle Around)
4. Midori Mizu Wakusei Nendaiki (Aqua Planet Chronicle Jade)
5. Ao Mizu Wakusei Nendaiki (Aqua Planet Chronicle Blue)
6. Mizu Wakusei Nendaiki Getsujou (Runyan) (Aqua Planet Chronicle Final)
7. Mizu Wakusei Nendaiki Gekkan Sachisachi (Aqua Planet Chronicle Monthly Sachisachi)