On her first day arriving in Japan, nine-year-old (Y/n) (L/n) experiences a tragic car accident, killing her mother but only for her to survive and wander the streets of Japan, not understanding a single word that is spoken to her. But even if she doesn't speak the Japanese language, that still does not stop her from accomplishing her goal of finding her dad. The only clue that is given to her about him is that he's a skateboarder. And the one place to start her search is at the highly secret and dangerous downhill skateboarding race that takes place in an abandoned mine, called "S." She makes new friends along the way, but will they feel like a family to this little girl?