Hai! Karate - Journey to Japan offers four children and four parents the chance to swap the stresses and strains of life in modern-day Britain for three weeks in Japan, being taught the traditional martial art of karate by the best teachers in the world. Forcing them to work together, will this experience enrich their minds, bodies and souls - and could it even improve their relationships? On their journey, they are immersed in the culture and traditions of both ancient and modern Japan, and face gruelling challenges that test their commitment and fighting spirit. They have just three weeks to gain their first belt, something that would normally take three months. Those who succeed will be given the privilege to perform at the World Karate Tournament in Okinawa. The families go head-to-head in a karate battle to prove who has the most fighting spirit and the strongest bond. As the journey to Japan comes to an end, what have the families learnt about themselves and each other through this extreme karate experience?