After Transmigrating into a Cannon Fodder Character in the 1980s, I Trash Them All - Chapter 700 - : Sealed in the Heart (1)

William Valehart was the absolute—supreme god of all existence. He ruled not a world, not a galaxy, but everything. Unbound by time, space, or death, he was omnipotent, eternal… and alone.By his own will, he sealed away his infinite power and chose to reincarnate. Not in defeat, but in search of something more. He boarded a world-sized ship and cast himself into the unknown, embracing mortality.He died—and awoke again.Reborn in a new universe, aboard the same titanic vessel, William finds himself in Urenus, a galaxy far larger and richer than the Milky Way. It’s here that a portion of humanity—just 5 to 8 percent of its population after conquering over half the Milky Way across millennia of war—has arrived through a now-vanished wormhole. Cut off from the rest of their civilization, they’re stranded, under siege, and barely holding out.Urenus is not unclaimed. Native civilizations, empowered by mana and superior numbers, have rallied against the human invaders. Advanced mech pilots are humanity’s last hope—warriors who push past mortal limits—but they are too few to win.That’s when William Valehart intervenes.With fragments of his sealed power awakening and his god-ship still under his control, he saves a human fleet from destruction—and learns of their fragile, desperate stand.He makes a choice.Not as a god who demands worship.Not as a savior bound by duty.But as a force reborn—who will fight beside them, reshape the war, and carve a place in this new universe.Because he can

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

Alix, a devoted player of Strongest Kingdom, finds himself reincarnated as his in-game avatar—the powerful and fearsome Demon King—in a mysterious and unfamiliar world. Armed with his gaming prowess and a penchant for stirring up trouble, Alix must navigate a realm fraught with danger, intrigue, and opportunity.As he discovers the secrets of his new domain, forms alliances, and faces relentless foes, one thing becomes clear: chaos follows wherever he goes. Will Alix rise to become the ultimate ruler, or will his wild antics lead to his kingdom's downfall?Join him in this thrilling, action-packed adventure where strategy, humor, and epic battles collide!

I am merely a reviewer, albeit the products I review are slightly different. For example, I review quantum computers, artificial intelligence, anti-gravity mech armor, planetary engines, sublight colonial ships, stellar detonators, etc…