Five years prior to the current story, Mana Nagase, a student, is on the Spring Festival Special Stage addressing new students while Kohei Makino watches. Later on Mana asks Makino to stay after school as she wants to ask him something. It's revealed she wants to be an idol and the she wants Makino to join Hoshimi Production with her and that she promised Shinji Saegusa, the president of Hoshimi Production, that she wouldn't join unless he hired Makino.