There are actually specific side figures which have quests to complete. Beating explained facet quests unlocks interactions with Lifestyle. Atsushi Takayama: Goal from Yumi Shiina's Synergy tales. A man who after saved harassing Yumi with unreasonably harsh reviews on her dancing effectiveness, which ultimately brought about her to quit https://www.youtube.com/watch?v=ILKyE5vBc8A