Penguin Brothers. To say the least, Hina's new high school is strange. She moves back to her old home town only to find that the high school is run by two opposing factors, and students identify themselves based on the color of their school uniforms: Black for the loud, violent Nishizaki followers, and white for the quiet, clean-freak Isshiki followers. And then there are those "grays," wearing street clothes. Hina finds herself stuck between the two factions' leaders and it appears to be turning violent.