Yuka is a pop idol set for her solo debut, only she cannot sing. She enrolls in a voice training camp run by a dubious voice coach, whose insanity soon becomes apparent. She believes Yuka is unworthy of being an idol and holds her captive.

Yuka, the center of an underground idol group of voice actresses, wins the number one spot in the popularity vote for six consecutive months and is set to make her solo debut. However, she is extremely tone-deaf, and her producer Akiyama and manager Aikawa are troubled. Then, she enrolls in a voice training camp run by a dubious voice coach, Miho. As the lessons progress, Miho's insanity becomes apparent, and she believes Yuka is unworthy of being an idol and holds Yuka's captive.