Samurai Adventure summary:

A mysterious enemy from another dimension suddenly attacks a rich country. The vassals panic at the outrageous situation. Genjuro, a samurai, is determined to defeat this huge, unidentified enemy. The only thing he can rely on is his will to be and his determination to survive against an enemy who wants to bring everything to nothing. A unique science fiction work by Masashi Tanaka with his outstanding descriptive skills and ideas!