Mar Heaven: Knockin' on Heaven's Door is an Action game, developed by Alpha Unit and published by Konami, which was released in Japan in 2005.

A junior high loser enters the vivid world of his dreams where, at last, he is a hero! Ginta Toramizu is a 14-year-old kid in junior high school who doesn't have a lot going for he's near-sighted, doesn't do well in school, he's not good at sports, and to top it off-he's short! But Ginta is a dreamer and has had the same dream 102 it's always in the same fantasy world where he is a hero blessed with all the special abilities he lacks in real life. Then one day a supernatural figure appears at his school and summons him-to the world of his dreams! In this strange universe filled with magic and wonder, he is strong, tough, agile-and he can see without his glasses! Thus, Ginta begins a quest in search for the magical items known as Arms, one of which may have the power to send him home. Joining him on this epic journey are his companion Jack and the valuable living, talking, mustachioed iron-ball weapon known as "Babbo", which everybody wants but, it seems, only Ginta can possess!