In this universe, there exists a civilization with advanced biotechnology. Using technology completely beyond human imagination, it has created all kinds of monsters as weapons. Monsters that can disguise themselves, infect others, and transform into members of other races are sent out as vanguards. They infect every species they can and turn them into slaves who submit to their civilization.
Whenever they encounter resistance, they create a beacon and send a signal to their masters, opening a Teleportation Gate leading to a distant starfield. That civilization then dispatches unparalleled, powerful biological monsters to invade and occupy the planet.
Fortunately, when this civilization's vanguard arrived on this planet, they crashed in Antarctica and were frozen in the extreme cold.
Unfortunately, they were excavated by a group of foolish humans.
Of course, none of this mattered to Duanmu Huai. There was clearly only one thing he had to do now.
"An eye for an eye. Since they've come to us, we'll go kill them!"
Driving the Titan Mecha, Duanmu Huai glared murderously at the spatial Teleportation Gate before him.
Mary was already used to this and merely sighed silently. Rias and Naruse Mio, on the other hand, were having trouble remaining calm. After Duanmu Huai killed the giant monster, they had immediately boarded the Titan Mecha to reunite with him and Mary. Judging from the current situation, however, it seemed they had made a terrible decision.
"W-wait, go over there? What kind of place is that? It isn't the Demon Realm, is it? Could it be another world? Or an alien planet? How are we supposed to come back?"
"We'll worry about that after we get there!"
Duanmu Huai had neither the time nor the inclination to care about such things. He quickly locked onto the coordinates on the other side of