Sacred Seven

Alma Tandoji, seventeen, keeps others at a distance due to a past incident. One night, Ruri Aiba appears at his door. She pleads with Alma to battle against the Dark Stone, creatures that can only be defeated by the power of the Sacred Seven within Alma.

Ruri is the new Chairperson of Almas academy, and calls him to her office to ask him again to join the battle against the Dark Stone. Meanwhile, a plane departs from a US military base, secretly carrying an extremely explosive material.

Ruri returns from London after buying a fine grade gemstone for Alma to use. During trip a routine trip home, she and her convoy is attacked by Knight, the one who caused the Darkstone incidents. Kenmi reveals his reasons of his research on the Sacred Seven and information on his history on Knight.

Ruri and Alma participate for the school fair. However, things turn worse when a few of Knight's Darkstone snakes cause problems. Wakana converses with Ruri to know her a little more.

Tandoji and the Geology Club went to a camp. There, Kagami and Tandoji found a darkstone and informed Ruri about it. They managed to defeat it without the geology club members knowing.

Ruri invites Alma to eat lunch with her. Alma feels very annoyed by Ruri. Knight kidnapped Ruri to get a serum that will help him control the darkstone in him.