时间推进到群雄割据、硝烟弥漫的战国时代。生于小国三河的松平元康（幼名竹千代，亦即之后的德川家康），在战乱中成为今川家的人质，过着还算平静无虞的生活，娶今川家重臣之女濑名为妻。然而，幸福的日子随着织田信长的到来结束。战火爆发，负责运送粮食到前线的元康，在生死夹缝间想起了什么… 回到家人身边？前进故乡三河？固守原地？…被迫做出抉择的元康，到底该怎么办才好？

本片收录了日本两大特摄英雄系列的资料，最后更有初代奥特曼和假面骑士一号合作战斗的短篇。

《假面骑士BLACK》映像特典

From Minoru Kawasaki, the director of "The Calamari Wrestler," "Executive Koala," "The Entire World Sinks Except Japan," and "The Rug Cop," comes the epic story of a giant crab who washes ashore, befriends a boy, finds love, and becomes a sports legend. The film has been described by Kawasaki as being 'like Forrest Gump...but with a crab.'

Terrorists hijack an oil tanker and threaten to blow it up unless Japan meets their demands.