Yamamoto Yohko and the team continue to fight and defeat Ness in the space contests that are used in the future in place of war to decide differences between worlds. In this sequel to the first Yamamoto Yohko OAV, Yohko, Madoka, Ayano, and Momiji try to find ways to enjoy their summer vacation, explore the ruins of an ancient civilization, and deal with a rival who is bent on defeating Terra's new ace pilot.