There are specified facet characters which have quests to complete. Beating claimed side quests unlocks interactions with Lifestyle. Atsushi Takayama: Goal from Yumi Shiina's Synergy tales. A man who after kept harassing Yumi with unreasonably harsh opinions on her dancing efficiency, which inevitably brought about her to quit dancing. https://www.youtube.com/watch?v=ILKyE5vBc8A