Living in a state of disarray, Yuzu Okashi, a reclusive writer, resides on her own. However, when Makoto, her neighbor, accidentally left her apartment key behind, Yuzu kindly provided her with a place to stay until her mother arrived. Witnessing the chaos within Yuzu's living space, Makoto vowed to become a nurturing and caring figure for Yuzu, akin to that of a mother's.