Kaguya has been offering advice to younger students, feeling it her duty to help nurture the next generation of idols. When Kaguya see an advertisement for Karen's Idol school in New York City, she believes it as an opportunity to expand and growth in order to be a better mentor. But studying abroad means being apart from Sakuya for the first time in her life, and she wonders if Sakuya can take care of herself in her sister's absence. Things get more complicated when the twins discover that their manager Hariu appears to be romantically involved with Tamaki.