Once upon a time, the birds and the beasts fought each other in a war. It was a terrible conflict, and the clever bats would side with the birds when the birds were looking victorious, and then they would become allies of the beasts when that side was winning battles. At last the war came to an end, the two parties reached an amicable settlement, and a great party of friendship was held. But when it came to the turn of the bats to perform in the program, their fence-straddling tactics were exposed, and everyone refused to associate with them. Since that time, the bats have been too ashamed to show their faces during the day, coming out only at night to flit silently around.
故事发生在2007年的香港。在迎接08年奥运的大环境下,影片讲述一群临近中五会考的中学生之间有关成长的青春故事。一部手机短片,一连串的荒谬事件,引发了九个少男少女之间的矛盾冲突。本来的信任依赖,渐渐发展成了彼此的猜忌与摩擦。站在懵懂与长大的十字路口,这些孩子们面对着友情与爱情的双重考验。而随之而来的家庭问题和现实世界的真实残酷,九位少年又当如何应对?青春的故事有很多,影片用幽默跳脱的手法细细讲来。《烈日当空》是由曾志伟监制的两岸三地“九降风”系列同名电影的香港篇。