For those who haven't hear of metal heart before:
Gaming Software company Mega Tech produces the fighting game series "Metal Heart". They invite the Metal Heart fighting champion, Hyun Min Woo to help test out their new game Metal Heart 2.
Little does Hyun know that Mega Tech is actually a weapons developer, hoping to use Hyuns 'beta test' to fine-tune the fighting skills of their new android model.
Little does Mega Tech know that the test has been sabotaged, and instead of feeding the android data from a fighting game, she's been loaded with the unknown predecessor to the Metal Heart fighting games, a dating sim!
All of a sudden Hyuns life has become a dating sim, complete with a brand new childhood friend (actually a Mega Tech employee). Problem is, if he gets a BAD END, everyone dies.