Yuki, the ace of the badminton club in her third year of high school, has a bright personality and is popular with everyone. On the day of the announcement of the doubles pairings, Yuki's pairing is Hina, who had recently begun to show her ability in second place. Hina is shy and lacks confidence, but with Yuki's encouragement, they gradually open up to each other and deepen their relationship. Yuki, who always shows an excited smile, and Hina, who is quiet and always with a smartphone in one hand. Although they were polar opposites, their harmonious play overwhelmed their teammates. Meanwhile, Yuki and Hina have a match with OB professional players. Furthermore, Yuki's boyfriend, Soejima, who is a college student, appears. Seeing Yuki happily talking to Soejima, Hina shows a thoughtful expression with a smartphone in hand. For Yuki and Hina, each of them is painful and ephemeral, and their precious thoughts and words, like treasures, eventually intertwine with unexpected stories.
