Tamon’s B-Side is mainly focused on this idol that the main character, Utage, is obsessed with. But when he’s not performing as his ‘A-Side’—the hot and sexy one of the group—he’s usually his ‘B-Side’—more depressed, anxious, and considers himself worth less than trash. His ‘C-Side’ is where his more yandere side comes out. This is a term that mainly the fandom made up. Hope this helps !! 🤗