Iroha Kamisaka is a high school girl who commutes to her school in Nikko City, Tochigi Prefecture, in her beloved Mini. Suddenly, Chizuru Ichijo, a high school girl who has run away from home and has nowhere to go, appears before her! Iroha, who only got her driver's license three days ago, starts drifting down Iroha Hill, beginning her laid-back yet exciting driving life!