In the year 2032, the legendary idol unit "7th Sisters" suddenly retired from the industry and disappeared. That was the end of the idol industry... until two years later, when a young glory-seeking employee is appointed to be the leader of Tokyo's next generation idol studio, "777 (Three Seven)," commonly referred to as Nanastar. However, the city continues to believe that idols are a thing of the past, and Nanastar is no exception. Their slump continues, but one day a mysterious and beautiful female manager approaches you and says, "If the idols of the past are gone, we'll just have to make new idols! True "sisters" linked by powerful bonds!" The story of the idols of the future, the Nanastar Sisters, will now unfold. (Source: Tokyo 7th Sisters Wiki)

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. [Written by MAL Rewrite]

With the Inter-high over and as the end of summer approaches, Sakamichi trains intensely with Imaizumi Shunsuke and Naruko Shoukichi so he can carry on Team Sohoku’s spirit of supporting each other entrusted to him by Kinjou Shingo, Makishima Yusuke, and Tadokoro Jin, the third years who will be graduating before long. One day, Team Sohoku receives an invitation to the Kumamoto Fire Country Mountain Race, an invitational race for teams that performed well at the Inter-high, and their captain Kinjou decides their core Inter-high team will attend.

(Source: Crunchyroll)

The movie will feature special guests such as popular familiar characters from the TV anime series and the latest Youkai from the upcoming Youkai Watch 2 sequel games.