The kids get involved in many action-packed racing adventures as they try to unlock the secret to getting home.非常喜爱MTB的翔,总是在后山的练习场『X区域』,与擅长机械的驱,和好胜心很强的女孩子まこと一起练习着。突然有一天他们接到了同样爱好MTB的鲛岛兄弟的挑战,如果输掉的话『X区域』就要让给鲛...