In his final year of high school, Kawano Hatsuyuki, known as a rare troublemaker, grudgingly attends classes to meet graduation requirements. On a snowy December day, he stumbles upon a captivating girl, Tamaki Sakura, dressed in white and searching for a rabbit. Days later, Sakura transfers to his school, sparking a transformative journey for Hatsuyuki as they navigate the passage of time through the four seasons. As 1095 days draw to a close, winter transitions to spring, leaving behind poignant memories of unfulfilled snow. Standing amidst fleeting moments from the first snowfall to the cherry blossoms, Hatsuyuki and Sakura mark a significant milestone in their lives—graduation.