who are the people for the side quests? how do you do the side quests?
This link is your friend: https://mylifebeyondthescreen.wordpress.com/2018/12/21/guide-seiyuu-danshi/
The only side-quest they miss on this one is if you do the quest for the Love Hotel Bear after reaching "Saint" level affection, you get a 70% discount on all love hotel visits! (ie: 5000Y room becomes 1500Y)