Watch Karakuri Kiden: Hiwou Senki Online

8 years ago, Western Civilization visited 19th century Japan. Mechanized dolls and new steam-powered creations began spreading throughout the country. The Wind Gang is a group of doll and steam users who believe in using their creations to violently bring about a new Industrial Era. They attack and destroy the peaceful village of a young doll user named Hiwou one day. Hiwou and his friends escape with a giant doll named Homura. Hiwou now wants to find his father, so that he can help defeat the Wind Gang, and bring peace back to Japan.

It is the time of civil war. Zipangu is a country where people live together with gimmick warriors, a kind of super human robot. There, people and gimmick warriors struggle to seize power. Musashi, a Samurai gimmick warrior, departs to on a quest to become the best Samurai warrior. Musashi thrives in the series of battles, encountering with many heroes and villains including his lifelong rival, Kojiro, an expert swordsman. Later, Mushashi and Kojiro are sent by their General to escort the Princess, a granddaughter of the general. The princess is spoiled and difficult, so their journey becomes series of misadventures. Soon, they are caught up in a battle to seize control of the Country.