A side-story providing an alternative retelling of the events of the anime as well as original stories.

Kawakami Momoyo is a notorious, woman-chasing, large-breasted master fighter. She and her friends at school end up in all sorts of weird situations, often involving people attempting to defeat Momoyo. Now there are new transfer students from Germany joining their class. Who are these new students, and will they fit in with the crazy bunch surrounding Momoyo?

Buntarou doesn't know what he wants to do in the future. He does not have any kind of dream that he wants to pursue, so currently he just spends his days hanging around with his friends. One day, his classmate Sayuki asks him if he wants to help with development of a gal game. She says that she had become interested in his help after she read one his works intended for the drama club.

Buntarou doesn't know anything about gal games, but Sayuki claims that she has the ability to make it a success. Can they make the game, and will it be a success like she claims it will be? This is the story of youths taking a daring step into the unknown...

(Source: Otaku Lair)