We take a trip back to where it all began, when Daijirou first discovered the mysterious robot Doamayger-D.
▽ Akero! Kakusareshi rekishi no tobira! [Japan: original Romaji title]
▽ Open! The Door of Hidden History! [Japan: literal English translation]
▽ Open it! The Door to a Hidden History! [Int'l: renamed English title]
