Shido accidentally and unknowingly drinks an experimental live potion made by Ratatoskr. He goes to sleep and thinks nothing of it, but the second his eyes meet with a certain blond spirit, his heart flutters and shenanigans begin.

10 years after the epilogue of IBO a 15 year old Akatsuki has joined Gjallarhorn. The reason being a declaration of war has been announced by Valorclaw an organization from Pluto. Valorclaw isn’t to be taken lightly they haven’t been beaten and an elusive group of supposedly powerful Knights are apart of them. But the son of the devil of Tekkadan can make a difference, right?