A college student, Umi and Hikaru, met by chance. They hit it off so well that they decided to live together for a month. The first thing they buy when they start living together is a washbowl called "Aramaito Senmenki," which was sold for 100 yen. They started out as "best friends," but they became aware of each other as the opposite sex...? This is a masterpiece that carefully depicts the emotional transitions of a young man and woman living together!