The Obliterated World and Remnants of Memories

Whilst being forced to clean the school pool Tomo and the rest of the Science Club stumble across an underground cavern which leads them to the Rakuroa Ruins. Here Tomo sees a strange vision of an alternate world. However, before he can learn more the group is attacked by Castas Machina guarding the ruins and Touru has to show up to save them.