Hina's new high school is, to put it mildly, peculiar. She returns to her hometown only to discover that the school is controlled by two opposing forces, with students aligning themselves according to the color of their uniforms: black for the followers of the loud and violent Nishizaki, and white for the followers of the quiet, cleanliness-obsessed Isshiki. Then there are the "grays," who wear regular street clothes. Hina finds herself caught between the leaders of these two factions, and the situation appears to be escalating into violence. As one might expect from the feminine art style and the Ribon publisher, a romance subplot emerges quite early in the series. A love triangle develops between two of the group leaders. Who will Hina choose?