Isekai Members Debut as Idols

A failing agency. Members who have all departed. In the end, the debut team collapsed without ever stepping onto a stage, and I was the only one left in the practice room. Just when I thought everything was over, new members appeared before me. The Archduke of the North, a person from the future, a mage, the successor of the Heavenly Demon, and a gumiho. ……Excuse me? Their visuals are top-tier and they are overflowing with talent. But why is getting them to do a single finger heart this difficult? "Your members' concepts are quite unique." ……If only it were actually a concept, I'd be happy. Still, I am no longer alone. This time, I will definitely make my idol debut with these othe...