Miura Aoi is an indecisive guy with a timid personality who dislikes summer. He once aspired to become an architect, but his dream has faded as he lets the days go by working as an assistant in a small architectural firm in Tokyo. Then one day, Aoi has a fateful reunion with Serizawa Akari, his first love and a childhood friend. Back in their school days, the two were always together. However, Akari suddenly disappeared in the summer of their third year in high school. Aoi forced himself to bury his feelings for her deep within him, but it could never truly be forgotten. Aoi's heart is once again moved by their unexpected reunion. However, there is another guy who is also named Aoi standing next to her..
Summer vacation has emptied a Japanese boys' school of all but three boys: the junior Norio & the seniors Kazuhiko & Naoto. They have no families to return to for the summer, so they spend their days in the empty school. A darkness hangs over the three however: the suicide, three months earlier, of classmate Yu. Norio blames Kazuhiko for Yu's death, because it was well-known that Yu loved Kazuhiko; so Kazuhiko is cruel to Norio, and yet has bad dreams. This uneasy arrangement is exacerbated by the arrival of Kaoru, a student early for the fall - who looks exactly like Yu.
While going back to Kinmen island during summer, Ah Kwan (Bryant Chang) learns from the internet about a pretty girl called Chen Wen Qing (Shara Lin), who emerged champion in the National Piano Competition. One day he coincidentally meets up with her. For both this is the best summer holiday they ever had in their lives. Before going back Wen Qing promises to Ah Kwan she would email him everyday and coming next summer, she would find him in Kinmen again.
Hot Summer Days? shares six entwined stories in which people strive to discover the true meaning of love, where the heat ignites emotions and changes lives forever. The six intertwined love stories are set in an unusually hot summer and feature some A-list actors like Nicholas Tse, Barbie Hsu, Jacky Cheung, Rene Liu, Daniel Wu and Vivian Hsu. There?s also an appearance of two kissing fishes voiced by Joey Yung and Jan Lam Hoi Fung! Of all the couples, the one that would move most hearts would be the love story between a middle-aged driver played by Jacky Cheung and a foot masseuse played by Rene Liu, in which the relationship starts with a mobile text message that was sent by mistake. There are a lot of funny interaction and also positive, heart-warming moments between these pairs. A point to note is that Barbie Hsu (?Connected?, ?On His Majesty?s Secret Service? who has always been known for her sensuous, feminine looks with beautiful long hair, turns into a rebellious biker chick in this movie! Her smoky eyes, boyish short hair, tattooed arm and tight clothes will surely take you by surprise. Other appearances include Shawn Yue, Gordon La and Charlene Choi.