[Crossover] I’m a Saiyan, but Totally Ordinary

My name is Sun Shenyu. I'm an ordinary high school student whose grades, looks, and abilities are all thoroughly unremarkable, as well as an extraordinarily ordinary Saiyan hero of justice. During a mission to save Earth, I accidentally fell into a vortex between parallel dimensions and ended up in a parallel world. As soon as I got out, I ran into a guy in a black hat who was slaying a dragon with an entire building. The Sun family has always had a great relationship with the dragon clan, so I knocked the guy in the black hat out with one punch. Later, the local authorities inexplicably put me on their wanted list. I had no idea why, so I quietly stormed their hideout and rescued a blonde girl who was being held captive by an unscrupulous boss. After that, I rescued a bandaged young man who had nearly drowned. To repay me, he said he'd help me collect the Dragon Balls and make a wish to send me home. Theme: None.