Case 3: Genius vs. God
Again... Spoiler alert! Read at your own risk!
Please do not assume that this is a correct translation until further notice.
The fight between Heidi and the mysterious person begins with the latter uses the harpy against Heidi. Later on, the mysterious person reveals the secret of his method of transforming humans into monsters by showing Heidi a series of pea pods, which he called Eureka.
He then uses it at himself, turning him into a winged-like figure. As they fight, the masked figure starts to gain an advantage. Fortunately, Heidi manages to escape after he is able to deliver a single punch that breaks the mysterious person's mask. As the scientist and his companion leave, a womanly figure appears. Calling the mysterious person as Killed, she reminds him that it is time for their dinner party.
Read the full summary here.