在这部哥哥的烟火剧情片中,位于日本新泻县小千谷市的片贝町，每年都会举行精彩的烟花大会，无论年事已高的老人，还是躁动狂热的年轻人，全都热情参与其中，此外更吸引了来自全国各地的游客前来观赏。然而，这里却有不一样的青春故事缓缓上演。花季少女须藤华（谷村美月 饰）罹患白血病，虽久经治疗却无好转。身为底层劳动者的父母辗转搬迁，只为留住女儿的性命。由于过于专注女儿，华的哥哥太郎（高良健吾 饰）性格日趋孤僻，更将自己锁在房中决不出门。华暂时出院，她想方设法让哥哥走出房门，并鼓励他出去找寻工作。失落的亲情渐渐修复，但华的生命烛火也逐渐燃尽…… 　　本片根据真实事件改编。

On September 9th, the day of the Katakai Fireworks Festival, high school student Hana comes home from the hospital after six months of treatment for leukemia. She then discovers that her older brother Taro has become a hikikomori (social recluse). Taro used to be tender, smart and proud of his younger sister, but now he even turns his back on her and stays in his room. Her parents act like there is nothing wrong with him. Later that evening, Hana attends the Katakai Fireworks Festival and observes the town's youth group happily planning for next year's event. She decides to get Taro involved with the group in an effort to bring him out of his shell. Hana drags Taro out of his room and to the youth group office. Unfortunately, Taro is not accepted as a member. Hana, nevertheless, is determined to get Taro back into society and helps him find a part-time job as a paper boy and into the adult meetings for the Katakai Fireworks Festival. With Hana's help Taro slowly opens up to the world ...

从前现在的我~。因为你是我心底最暖的地方，所以我不怕外面风狂雨凉。。感情不是烟火般转瞬即逝。最美不过满天红色爱的烟花。。来过，爱过，绽放过。此刻的心愿，永远的牵绊。哀而不傷。单纯而美好的仪式感。有这样的妹妹真好。那些中二的青年总给另一些中二的青年以最大的感动。