The deterrent role of Kaiju in peacetime was rapidly replaced by nuclear weapons, which were less costly and safer than Kaiju.
All kaiju possessing countries introduced nuclear weapons, and at the same time, the kaiju were disposed of without any hesitation.
The two domestic kaiju created by the team of the late Dr. Fuyumi Sanagawa, a key figure in Japan's monster development, were no exception to this rule and were waiting to be destroyed.
However, an incident occurred.
It was discovered that one of the two domestic Kaiju, Kalanchoe, had developed intelligence.
The Kalanchoe escapes during transportation to the processing plant, and sits on the edge of the Inoue Plant Zone with all the country's food supplies, effectively holding it hostage and demanding the right to survive for itself.
The remaining kaiju, the Asurasheed, was deployed to the area to respond immediately to the situation, but the case of the Kalanchoe made the Asurasheed unreliable as a weapon.
Negotiations came to an end without finding an effective countermeasure against the Kalanchoe.