Rebirth Begins with Pacific Rim

The protagonist makes his own mechas. In the early stage, he will transform monsters into mechas and then create more mechas and artificial humans for counterattack. There is no female protagonist. After the male protagonist dies in one world, he will be reborn in another world and retain his memory. The next world will be a super seminary, without a system. A new attempt, I hope everyone will like it. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.