In a utopia whose perfection hinges upon control of monogamy and privacy, members of the collective begin to question the rules, putting their regimented society on a collision course with forbidden love and revolution.

Sisters Josie and Billie and their single mother Deb navigate life armed with nothing but poor judgement and self-esteem exclusively tied to people who couldn't care less about them. They're vain, selfish, heavily in debt, pathologically desperate for affection and bursting with misplaced, terrifying love.

Students, including Aoi Nishino, take part in class and sports activity at a prestigious high school. Aoi Nishino is a member of the school's archery club. He practices archery studiously and doesn't socialize much with the other students. His childhood friend Haruka Seno is also a member of the archery club, but she worries about Aoi Nishino. One day, thunder strikes the school grounds. After that, the ordinary lives of the students changes drastically. Many samurai descend on the school grounds. It appears that the entire school has traveled back in time to the Sengoku period. Making things worse, they realize that they are in the time right before the Battle of Okehazama takes place.