在大正年间的烟花巷，艺妓花清怀着一个迫切的心愿——为她的恩客生下一个孩子，然后以妻子的身份嫁为人妇。然而，命运却对她有着不同的安排。三年的相处中，花清未曾生下一个孩子，让她备受失落与妒火的煎熬。而她的恩客宠幸的另一位艺妓染八，却生下了一个可爱的男婴，成为了宠妃的地位。在一次探望之际，妒忌和渴望让花清做出了一个令她自己都意想不到的决定——抢走了染八的婴儿

转眼到了昭和年间，烟花巷的风景早已不同。花清独自经营着一家妓寮，手下有着两位青春美丽的艺妓，小福和小八重。而那个曾经的男婴，现在已经长成了少年正太郎。他从小在烟花巷长大，对这里的一切都心知肚明。花清为了防止正太郎走上不归路，将他送到恩客岛村经营的电影院学习。然而，这个决定却引发了一系列意想不到的事件。

在电影院里，正太郎逐渐走近了电影的神奇世界，同时也认识了一位充满智慧的老影人。在影院的黑暗中，正太郎的内心开始发生微妙的变化，一种奇妙的情感萌芽了。他开始憧憬着电影中的故事，开始思考着人生的意义。电影不仅成为了他学习知识的场所，更是他性启蒙的源泉。

In the Fireworks Lane during the Taisho period, the geisha Huaqing had an urgent wish - to give birth to a child for her benefactor, and then marry as a wife. However, fate has different arrangements for her. During the three years of getting along, Hua Qingwei never gave birth to a child, which made her suffer from disappointment and jealousy. However, Ranpachi, another geisha favored by her benefactor, gave birth to a cute baby boy and became the favorite concubine. During a visit, jealousy and longing made Huaqing make a decision that even she didn't expect—to take Ranba's baby away

In the blink of an eye, during the Showa era, the scenery of Firework Lane has long been different. Hua Qing runs a brothel by himself, and has two young and beautiful geisha under him, Xiao Fu and Xiao Yae. And that former baby boy has now grown into a young boy, Shotaro. He grew up in Firework Alley, and he knows everything here. In order to prevent Shotaro from going nowhere, Huaqing sends him to study at a movie theater run by Enkedao Village. However, this decision triggers an unexpected chain of events.

In the movie theater, Shotaro gradually approached the magical world of movies, and at the same time met a wise old filmmaker. In the darkness of the theater, subtle changes began to take place in Shotaro's heart, and a wonderful emotion sprouted. He began to look forward to the stories in the movie and began to think about the meaning of life. Movies have not only become a place for him to learn knowledge, but also a source of his sexual enlightenment.