A financially struggling café is closing at the end of the summer. Protagonist's nieces feel sad about the café's closure and want to spend the last summer together with their uncle and everyone else at the café. They decide to help out at the café for the last month. However, upon reuniting with the nieces, protagonist is surprised by their unexpected growth and development. The nieces' carefree behavior is too much for the him, a single man in his thirties, to handle. Will he be able make it through the summer living under the same roof together with them?