Without the presence of both their deceased mother and their debt-ridden father, sisters Kyou and Asu Yamada are forced to fend for themselves. Thankfully, they at least have a roof over their heads: a small room in an old apartment spacious enough to fit both of them. However, to make ends meet, the older sister Kyou strives to juggle various part-time jobs—all while making sure that she and her younger sister can continue studying.