Bisco and Milo are out searching for Ghost Hail mushrooms for a pregnant Pawoo when an airborne ark appears and abducts them in an attempt to "save" the creatures of Earth. But just when things start looking desperate, Milo miraculously gives birth! The mysterious mushroom child Sugar Akaboshi wastes no time in freeding them.

But there are many other creatures who’ve been "saved" on the ark. If our heroes want to free them, they''ll have to awaken Sugar''s true powers...