The manga's spinoff story centers on the Revenant Louis, who is also known as Sekiken (Red Sword).

The novel, “Re:member,” from the popular idol rhythm game makes it to comic format! The past of Idolish7's senpai group, Re:vale, is finally revealed! What hurdles have Banri, Yuki and Momo overcome before the formation of the group...?

Due to natural disasters caused by the world regeneration which took place two years ago. Two researchers, Richter and Aster, are trying to find the spirit Ratatosk who seems to be the only one able of restoring the balance of mana.