Alma Tandoji keeps distant from others due to a past incident. One night, Ruri Aiba appears at his door. She pleads with him to battle against creatures called the Dark Stone.

Ruri is the new Chairperson of Alma’s academy, and calls him to her office to ask him again to join the battle against the Dark Stone.

Two vehicles scream down the road. Chief researcher, Yuji Kenmi, who ensures the power of the Sacred Seven is not used for evil, is in one. Suddenly, a mysterious man appears.

The students are hard at work for tomorrow's school festival. Alma is helping when a Dark Stone slides onto campus. Kagami hides this from Ruri so the festival won't be cancelled.

The Rock Club is headed to the beach! There’s a legend that the local pyramid is dedicated to the rock gods, much to Wakana’s delight. But Alma senses a Dark Stone inside.

Using Fei’s blood, Naito has created a serum to stop the Dark Stone progression within his body. But the process is too much for Fei. They need a new source for the serum…