What to Do with the Dead Kaiju?

A large monster attacks Japan, but dies suddenly. It's only a matter of time that a gas explosion will take place from the carcass of the monster, which could cause the country to collapse. Obinata Arata is assigned to lead a special force team into the critical area. Amane Yukino appears in front of Obinata Arata. She is the secretary to the environment minister and also the ex-fiancee of Obinata Arata.
(Source: AsianWiki)