Эп. 5: Хёдо объявляет о смене жанра и назначает Ретико ведущей вокалисткой, заметив её исполнение в стиле дэт-метал.

5

While taking Manaka to practice her new song in a karaoke bar, Hyodo unexpectly spotted Retsuko's singing death metal. The next day, Hyodo finally reveals that the idol group will change their genre, and appoints Retsuko to be the lead singer. Initially, Retsuko refused, as she doensn't want to let everyone know of her death metal singing. She keeps on seeing Washimi for a pep talk and also learns that Haida keeps on seeing Inui. Later that night's concert, Hyodo keeps on having the new song played, forcing Retsuko to finally agrees to be the idol's lead singer. (Source: Wikipedia)