Ayane Suzukawa is turning thirty and decides to celebrate by hosting a birthday party for her friends. However, an unexpected storm hits, causing one cancellation after another until she's left completely alone with the dinner she prepared. Just as she begins to lose hope, she receives a sudden call from Minami, a senior coworker she secretly has feelings for. He's stranded near her place due to car trouble and ends up joining her. What starts as a quiet, lonely evening takes an unexpected turn as the two spend the night together.