OVAs bundled with volumes 42, 43 & 46 of the Aa! Megami-sama! manga.

In the Outside World, only a few people know of the hidden realm called Gensokyo. Two of those individuals are Maribel Hearn and Renko Usami—the sole members of the Secret Sealing Club. Together, they dedicate themselves to learning more about Gensokyo, ranging from the Genso-Lunar War thousands of years ago to the history of the Moriya Shrine. Whether it be small talk, in-depth discussions, or tracking people who may have connections to this mystical land, even the sky cannot limit their growing curiosity. [Written by MAL Rewrite]

Momo is the princess of Fenarinarsa, a land of dreams that is getting further and further from Earth. She is sent to help the Earth regain faith in its dreams. To assist her are her friends Sindbook, Mocha, and Pipiru and her magic wand that transforms her into an adult. She's ready and willing to help anyone she can in order to make their dream come true, no matter what happens.