Miou Aida and Haruki Serizawa might seem like polar opposites to those around them, but as the two third-years prepare to end their high school experience, they couldn't have been closer. While Miou is a shy and reserved member of the school art club that prefers to stay out of the limelight, Haruki is the boisterous and confident ace of the movie club, already winning awards for his directing prowess. However, after a previous chance encounter during their school entrance ceremony, they quickly become friends despite their stark differences in personality. But although their closeness might be growing, they've never become anything more than just that, much to the bewilderment of their friends. As their time in high school draws to a close, Miou and Haruki, along with their friends in the art and movie clubs, have just one year left to face their hidden feelings and the daunting task of deciding their future careers. The two might always be only an arm's reach away, but as Haruki chases his dream of becoming a professional movie director and Miou struggles with choosing a path for herself, they'll learn just how hard it is to get past those last 10 centimeters.

Following Natsuki Enomoto's confession rehearsals with Yuu Setoguchi, their younger siblings Kotarou and Hina struggle to confess their own love. Despite a disastrous first meeting in middle school with her upperclassman Koyuki Ayase, Hina’s heart is captured by his warm smile. Initially confused by these newfound feelings, Hina soon realizes that she has fallen in love for the very first time. Chasing after her brother Yuu and her crush Koyuki, Hina also enrolls in Sakuragaoka High School; but the threads of love are far-reaching, and they entangle Hina and her friends. Boisterous but sensitive, Hina hopes to confess her feelings to the tender-hearted Koyuki. Meanwhile, Kotarou, oblivious to his own feelings for her, is determined to always keep Hina smiling. Suki ni Naru Sono Shunkan wo.: Kokuhaku Jikkou linkai follows Hina, Kotarou, and Koyuki in high school. Their youthful love forges new relationships, but also threatens to break others.

Love is blooming at Sakuragaoka High School. Natsuki Enomoto has finally mustered the courage to confess to her childhood friend, Yuu Setoguchi. However, in the final moments of her confession, an embarrassed Natsuki passes it off as a "practice confession." Oblivious to her true feelings and struggling with his own, Yuu promises to support Natsuki in her quest for love. While Natsuki deals with her failed confession, fellow classmate Koyuki Ayase struggles with his own feelings for Natsuki. Despite his timidness, he is determined to win over her heart. Zutto Mae Kara Suki deshita.: Kokuhaku Jikkou Iinkai follows Natsuki as she dreams of one day ending her practices and genuinely confessing to Yuu. Meanwhile, close friends also find themselves entangled in their own webs of unrequited love and unspoken affections.

Throughout life, people come and go, eventually departing with a goodbye. For childhood friends Natsumi Aizawa, Yuka Hanaki, and Rinko Tamaki, they are confronted with this harsh reality when they are told their group's fourth member, Saki Mizukoshi, is moving away at the end of summer. With this news threatening their friendship, the four girls seek out a magic stone from local folklore—hoping to use its rumored wish-granting powers to keep them together. After following the steps of the supposed legend, they are surprised to discover that the magic is real. While the summer's end looms over the horizon, Natsumi and the others use the stone to ensure they have no lingering regrets until the end. But regardless of what the future might bring, these four friends will never forget the colorful miracles they experience during what could be their final summer together.