Appearing in the floating ice castle "Agato's Crystal", Kids Munto launched an attack on the ceiling of Yapan with the superweapon Agato Gravity. Gain invades the crystal to stop Agato Gravity. Gaynor and Sarah, who failed to rescue Cynthia last time, also invade. The three of them were aiming for the center, but in the center, the engine room, there was something unimaginable.