Wrath of the Necromancer

It's been about a week since Shinji and Miki married, and she takes him to Mt. Fuji to meet someone special; her young son, whom she named Masato, after Shinji's father.  She then revealed that Shinji himself is the father.  Carver and Azusa come in to congratulate them, but Ibuki arrives; he escaped by shooting his hand off with his gun.  He demands that Miki and her son come with him to live a happy life, but she stands up to him and refuses.  And when Shinji stands up for her, Ibuki furiously tries to kill them.  But then, the Fuji Crater, which is the site of the asteroid that started the Necro-Kaiju Incursion, shakes and the volcano erupts, revealing the source of the Necro-Kaiju: an enormous Kaiju with a bizarre face and deathly colors of black and white.  

The heroes escape in time before the new Kaiju, later named Necrotherium, obliterates Miki's home, along with Ibuki, who is completely vaporized.  Miki then remembers that the Elias told her about a creature like this, and the Earth's Kaiju would converge to stop it.  Fire Lion, the Visitor, and Lightning Bug arrive to fight the enemy, enabling Shinji, his family, and friends to escape to the GDF base and prep Blazing Guardian.  What followed was possibly the most stunning victory in Kaiju history… Although outnumbered three to one, Necrotherium quickly and utterly defeated them. The fight was literally only minutes in its brutal duration, and all three Kaiju were killed; Fire Lion was sliced in half vertically, the Visitor was infected into a Necro-Kaiju while still alive, and Lightning Bug was completely vaporized.  Necrotherium took to the sky and began flying off at a remarkable speed, the mere power of his levitation demolishing half of the Mt. Fuji area!  He flies across the Pacific, vaporizing Okinawa and killing King Caesar in the process

Necro arrives in San Francisco and begins to destroy it utterly, vaporizing the San Francisco Dome completely with his Afterlife Blaster.  Titanosaurus arrives to stop him, but he is swiftly decapitated.  Then Blazing Guardian arrived to sword-fight with him.  Miki uses her psychic powers to get Godzilla to come to San Francisco.  He arrives and engages in a vicious battle with Necrotherium, who summons multiple Necro-Kaiju, even fusing several into a huge creature, which Mothra in his armor form destroys.  As Godzilla starts to loose the battle, Mothra summons the spirits of the dead Earth Kaiju, and Godzilla turns into Super Godzilla.  Aided by the spirits of Anguirus, Rodan, King Caesar, Gorosaurus, Battra, Zilla, Titanosaurus, Kamacuras, and Kumonga, Super G rips Necrotherium's sword off and then destroys him with a Hyper Spiral Ray, destroying all remaining Necro-Kaiju and saving the world in the process.

After turning to normal, Godzilla turns to Blazing Guardian and shoots it down, then prepares to destroy it , but Mothra, now in a new form, finally manages to convince the Kaiju to stop, and he leaves.  The world is safe, but the Necro-Kaiju Incursion reduced the world population from 7 billion to 400,000, and Shinji settles with Miki and their son while Carver marries Azusa.  As Godzilla leaves, he gives out one final roar for all to hear...

Kaiju/Mecha:
-Godzilla

-Necrotherium
-King Caesar
-Titanosaurus

-Blazing Guardian

-Fire Lion

-The Visitor

-Lightning Bug

-Mothra Leo