During her junior high years, Sumire Suou's soccer performance was unexceptional. Yet, her opponent Midori Soshizaki suggested a unique proposition. Soshizaki urged Suou to join the high school soccer team with a promise to never leave her alone on the field. Suou must decide whether she should accept the genuine proposal. Thus, a story begins, introducing a diverse cast of characters who all share a passion for soccer.