Yumeko challenges Terano Totobami to a gamble for Student Council presidential election votes and they agree to play a game called the "Greater Good Game" presided over by Rumis Uru. The players agreeing to participate are Yumeko Jabami, Itsuki Sumeragi, Kaede Manyuda, Miloslava Honebami and Ibara Obami. The game involves choosing whether to place coins in a Personal Bank Box for their own gain, or into a Tax Deposit Box which will increases coins for all players. Before the first round, Yumeko suggests that everyone place all their coins in the Tax Deposit Box, but ...