It was 3002, and human civilization had crumbled and rebuilt itself repeatedly over the thousand years, despite the destruction and challenges brought by harsh nature. In this era of constant war against nature and havoc, construction teams were the stars of the economic system, serving as both a conquering force and a weapon themselves, because heavy robots were used in construction work to speed up efficiency. Jumbor was the leader of a famous construction team in a small country with a cute princess. One day, as their group was about to start reconstruction work on a tunnel destroyed by an earthquake, a much more powerful construction team arrived and claimed the land in no time, killing Jumbor, who had tried to protect his teammates against the cruel opponents... Jumbor woke up in 3007, finding himself revived in his own clone body (with transplanted memory), which had a physical age of 5 years old. In addition, his body was partly mechanized. His robot arms are linked to and directly controlled by his brain's signals. He was told that the country was gone and that the princess and the king had disappeared, and he discovered that his mechanized body was very powerful. He was also told he was the 'last of the series.'