After my parents died in a traffic accident five years ago, I've been living alone in this house, slowly spending down the insurance money. I've spent my days in loneliness—until one day, an NPO organization worker suddenly showed up at my door. Her name is Sumire, and she apparently harbored special feelings for me. I now desperately want to marry her. To make that dream come true, I have no choice but to push myself even harder than before.