Very interesting. A NES game that was only released in Japan. It never made it to American shores due to the 'explicit graphic nature' (violence) of some scenes. The game is often cited to be a predecessor to the Resident Evil series on the PlayStation. Most notably are the door-opening sequences.
Today, you can get your hands on a brilliant translation.
Unofficial (perfect) translation available by Gaijin Translations and Suicidal Translations.