Yosuzume (夜雀) is a habitable tropical jungle world and the third planet in the Genbu System. Yosuzume is known for its thick tropical jungle belt, which covers a large majority of the planet. The jungle plays host to a very diverse population of avian species, most notably, the Kotoryu, large predatory dinosaur-like birds which often cause a threat to the planet's settlers. Yosuzume are bird yokai in Japanese folklore, the planet named for its many avian species. Yosuzume is the homeworld of Kazuo Tsutomo.