That JAV

Dr. Yagami, an evil scientist, plots to defeat the beautiful girl masked Aurora. He spawns monsters one after another to attack Aurora, but they all end in failure. Then, a monster appears before Dr. Yagami and asks him to join forces with her. At first, Dr. Yagami rejects the monster's proposal, but realizing that he is no match for Aurora by his own strength alone, he accepts the monster's proposal. Dr. Yagami disguises himself as a sickly old man and asks Aurora... Will Dr. Yagami be able to defeat Aurora? And what is the true identity of the heroine hunter? ［BAD END]