Kouchu Misako, Shauna Genga, Sakuro Himensho, and Roaracryst went to the Thunder Island when they were invited there by Iccryst's daughter. Kouchu and his friends went to the Thunder Tower to the king and introduced themselves. He told them that Thunderai was coming back in the Crystal world. When they got out, they were looking for shelter while looking for Thunderai. The forest was enormous, bright, and ancient. Its canopy was monopolized by alder, hawthorn, and hickory, who left just enough light for a mosaic of plants to monopolize the boulder covered grounds below. When they encounter Thunderai, Thunderai tells them that he needs help with getting rid of the ruby jewel. When they went there, the evil master Tyree, have stolen Thunderai's energy, and Kouchu his friends saves his energy from Tyree.
