Hikari Tsutsui is a third-year high-schooler shunned for his otaku habits, his only friend the fellow oddball Yuto Ito. Assigned pool-cleaning duty as punishment, he is paired with Iroha Igarashi, a beautiful classmate with a bad reputation who embodies everything he resents about real girls. When the blunt, openhearted Iroha asks him out, Hikari turns her down at first before deciding to give a relationship a try.