At the arena concert of popular idol group Batteries, several thousand attendees have disappeared! Behind the incident is BiBiBi Productions, a talent company started by Ratman. Kitaro and Cat-girl race to the scene and find Mana has just arrived there too. Kitaro tries to make Mana keep her distance, saying, "humans should not meddle in the affairs of yokai." But Mana refuses to go home, saying, "my friend has disappeared." Kitaro and the others sneak into the arena where a youkai has sucked up all the audience and swelled to an enormous size...!