On the brink of becoming a house pet, Mary must find a way to earn money. Trust is on the line when she and her friends attend a "coupling party."

With a traitor in their midst, Mary struggles with trusting her friends. Meanwhile, the opposing boys' team argues over whether to rejoin the game.

Sakura and Mary brace themselves for the final game. In desperation, Mary asks her friends for help, using whatever means necessary to win.