Mitsui Aika, Koharu Kusumi and Qian Lin have been best friends since nursery. They have always been together, and are now about to go to high school together. However, as they settle into their new school, Koharu finds herself with some of the Year 9s, who have quite a bad influence on her. Koharu then tries to LinLin and Aika into the stuff that her and the Year 9s were doing in secret, that is smoking, and skiving. LinLin and Aika know that this is wrong and that Koharu should have stayed with them, but at the same time Koharu is one of their closest friends and they don't want to upset her by saying no. What do they do? Read on to find out.