At first, Kazuki only played because it was fun, but soon challenged himself. Being accepted into the concours made him pumped and that's when he met other muscians and Hino. After falling ontop of Hino and realizing how gentle girls can be, he soon developed a crush for Hino and made it quite obvious to others without even realizing. He is the first one to realize that he is in love with Hino Kahoko. (In Chapter 39)