The Fallen Hero Living in the Machine Age

"I lost everything, but luckily I met you..." More than a thousand years ago, with the death of the Demon King, the brave man became a legend. Likewise, there are no more brave men in the world. A thousand years later, humans captured a sound from space, but... That sound, it was... Not friendly. The biological weapons released by alien invaders caused a large number of human deaths. But all this changed with the birth of the first generation IU mecha. ... "Who are you..." "Can I... Be your brother?..." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.