On the day summer comes to an end, the Kitagawa couple visit Chihiro's parents' home. They had planned to enjoy the local festival and fireworks together, but due to her husband's sudden work assignment, Chihiro is left behind alone. Though it's due to work circumstances, the abrupt change leaves her shocked and heartbroken, spending her days filled with loneliness in her husband's absence. That night, she turns inward, seeking to fill the emptiness inside. Then, an old acquaintance pays her a surprise visit—his arrival stirring unexpected emotions and setting off new ripples within her heart.