Megami Tensei: The Trapped Generation Warriors

After the hero defeated Lucifer with the help of humans, suddenly the whole place starts to shake which causes the group and hero to run back but it came at a cost when the hero makes it out but the rest of the group being trapped in the daimakyuu sinking into the netherworld trapping them for 500 years. After the long years 3 next generation warriors of the hero vow to bring back the humans trapped for 500 years but they will have to face challenges. Will they make it back to the surface and save all the trapped humans or will it all go to waste.