A towering monster, the fourth form of Godzilla greatly increased the power of the creature. Through a combination of nuclear fission and oxygen conversion, the beast was now fully able to travel on land.
In its fourth form, the beast first appeared in Sagami Bay. Japanese citizens from Cape Inamura in Kanagawa watched as the enormous creature traveled to the shore. The Kamakura disaster prevention alarms kicked in, warning of the evacuation of the surrounding area. The notification came too late, though, as Godzilla arrived on land and trampled through towns still populated by fleeing citizens.
Moving toward Kamariya, the creature advanced on Kanagawa before its true destination was apparent: Tokyo. Willing to run the risk of spilling radioactive material, the government granted the self defense force unrestricted weapon use in handling Godzilla. The military elected for Kawasaki as the primary battleground. Deploying ASDF F-2 fighters and AH-1S attack helicopters, a large scale aerial war was planned. In addition, the Tama River bank in Tokyo was lined with GSDF Type 10 Tanks.
The helicopters were the first to strike, flying over Musashi-Kosugi Station as they engaged Godzilla. Their assault involved shelling the nuclear menace with auto cannon fire, although the ammunition bounced harmlessly off of Godzilla's thick hide. The Apache 30mm were utilized next, but were similarly ineffective. 16,000 rounds of machine gun fire were unloaded in all, but none had any effect. Furthermore, the creature was shrinking the 12,000 meter gap that separated it from the helicopters from when the attack started. Moving to a distance of 700 meters from their target, the AH-1S fleet unleashed their missile payloads at Godzilla's face. All of the missiles hit their target, but left no visible damage.
With the helicopters ineffective, phase two began as the tanks near Tama River aimed at Godzilla. The attack plan was changed, though, moving from assaulting the nuclear menace's face to focusing on his legs. Shelled with tank fire, Godzilla started to slow his advance. Type 99 155mm Howitzers then proceeded to rain artillery fire on the monster's face again. The Type 96 Multi-Purpose Missile System joined in the siege, as Godzilla was shelled from multiple directions. Turning toward the Tama River, Godzilla approached the shore as the M270 MLRS fired long range weaponry at the monster. As Godzilla stopped his advance, phase three began, involving missiles dropped from the F-2 fighters. Despite the immense explosion, though, the mutated beast began to move again, destroying the Tama River bridge.
Sending the SDF into disarray, as they called off their attack, Godzilla breached Tokyo, venturing into the Meguro Ward. The offensive was not over though. Through the night, the United States deployed three B-2 Spirit Stealth Bombers to the area. Releasing their Massive Ordnance Penetrator (MOP), the bombers breached Godzilla's thick hide before detonating. The attack sent a massive geyser of blood into the air, wounding the nuclear menace.
Godzilla was far from defeated, though. Quickly adapting, the creature separated its bottom jaw as its dorsal fins began to glow purple. The being first released an immense blast of fire, destroying much of the city, before the breath weapon became concentrated into a thin, powerful ultra atomic ray. This beam was used to down one of the bombers, scoring a direct hit. The remaining bombers attempted to retaliate, only for Godzilla to change his attack, unleashing a torrent of beams from his dorsal fins. The rays not only destroyed the bombs, but also the bombers. With his immediate attackers destroyed, Godzilla turned his weapon on the city, firing his atomic ray from his mouth, igniting most of Tokyo.
As the city burned and high levels of radiation plagued the region, Godzilla walked briefly before becoming motionless near Tokyo Station. The creature had expended too much energy, causing its body to overheat.
With much of the former government killed in the attack on Tokyo, an interim cabinet was appointed and countermeasures against Godzilla prepared. This included a freezing attack plan involving 24 blood coagulants. Countries around the world became cautious, though, as China and Russia moved toward taking over the offensive against Godzilla. The United States hoped to continue to ally with Japan alone, though, in handling the monster. This resulted in the forming a US Godzilla Joint Research Team within Japan to study the beast. The group both discovered the monster's radar power and also its ability to adapt, including a way to produce asexually. Realizing the creature could even evolve wings and fly to other nations, the research team was dissolved as the US prepared a nuclear strike with a B83 bomb to completely remove the threat. Through the backing of the United Nations, an evacuation window was planned as the strike was readied. Using the evacuation window as their deadline, the freezing plan was accelerated. However, Godzilla's body started to slowly glow, as it was projected that 360 hours remained before the creature would be back to previous power levels.
Meanwhile, what's left of the research team discovers that, beyond containing new radioactive isotopes in its body, Godzilla is able to convert oxygen and nitrogen into the necessary molecules needed by its body. A mixotroph that converted decaying heat. This meant, coupled with an internal nuclear fission to drive it, the creature could thrive in any environment that contains oxygen or water. This meant possible complications for the freezing plan, now called Operation "Yashiori", although regardless the interim prime minister gave approval.
Focusing on the coagulants that proved most successful against samples of Godzilla, the projected completion was 3 days... 1 day longer than the team had. Seeking to delay the countdown, the Japanese petitioned to the French, who in turn petitioned to the UN against the wishes of China and Russia. Eventually, the United States got behind Japan, offering up forces to aid in Operation "Yashiori".
With the necessary manpower and materials secured, the operation commenced against the still overheated Godzilla. The first strike took the shape of unmanned N700 Series Bullet Trains. Lined with explosives, the vehicles drove directly into Tokyo Station, detonating on top of Godzilla's feet. The mutated beast immediately awoke, bellowing a challenge at the assault.
This kicked phase two into action, as the US Air Force launched their attack. This involved a squadron of Unmanned Combat Air Vehicles. Dropping their bombs, Godzilla's phased-array radar and dorsal fin atomic fire rays engaged their targets, destroying both the bombs and the air vehicles as the rays lit up the sky. Hoping to force Godzilla to expend too much energy, a second squadron of Unmanned Combat Air Vehicles joined the attack. Like the first squadron, their weapons and the crafts were destroyed by atomic fire rays. This was followed by another squadron and yet another squadron, who both met the same fate. As the fifth squadron was launched, Godzilla's energy was generating too much heat, no longer able to use the atomic fire rays from his back. As their missiles collided with the target, causing a conflagration around the mutated monster, Godzilla's tail began to glow. Launching an ultra atomic fire ray from his mouth and tail, Godzilla used his radar to destroy the fifth squadron. Against mounting radiation pollution to the city, a sixth squadron of Unmanned Combat Air Vehicles was sent into action. Godzilla expelled more energy to destroy the crafts, now stuck in a state where he was no longer able to use his atomic fire ray for fear of overheating.
This commenced phase three of Operation "Yashiori", as local office buildings were detonated, burying Godzilla under tons of rumble. Phase four started immediately afterwards, as the US Navy used the Arleigh Burke-class destroyer's Aegis Combat System to fire guided missiles. These cruise missiles detonated on nearby buildings, burying Godzilla under even more rumble.
With Godzilla down, the final phase went into effect as special cranes arrived on the scene. Using bulldozers to clear the path, the cranes approached Godzilla and began injecting the coagulate through the monster's mouth. With 30% administered, Godzilla's dorsal fins began to glow, as the creature risked overheating and fired its atomic fire ray, destroying the nearby cranes.
As Godzilla started to walk away, his movement started to slow from the coagulate. More trains, from the E233 and E231 series, were sent in, detonating their payloads against Godzilla. The explosion was enough to send the nuclear monster crashing to the ground. The second and third special crane platoons then approached their target. They also began to administer their coagulate, orally, to Godzilla. With 100% of the coagulate injected, the monster's skin began to harden. However, the beast closed down on its mouth as it stood, dropping the cranes to the ground below. As the creature's fins started to glow, it released a roar as the monster's body froze. The beast's temperature had dropped to -196 degrees. The threat to Japan had been stopped, while it was discovered that the half-life of Godzilla's radioactive isotope was a mere 20 days. This meant the radioactivity stricken areas would be halved in less than a month and totally gone within 2-3 years, taking with it the last of Godzilla's reign of terror.