After a festive camping trip with her newfound companions during Christmas, Rin Shima ventures on a solo expedition to witness the New Year sunrise at the seaside. However, her journey takes an unexpected turn as inclement weather hinders her return home, leaving her stranded. Fortunately, Nadeshiko Kagamihara extends a warm invitation to stay at her grandmother's place. What was intended as a brief escapade evolves into a prolonged adventure filled with exploration and novel encounters for Rin, as she crosses paths with familiar and unfamiliar individuals during her stay.