山奥の工事現場に怪獣が出現！だが、その怪獣は何故か突然死んでしまった！？山奥に怪獣の調査に向かうアユムと後輩のカミヤだったが、その山中に同種の怪獣が現れ、追いかけ回された2人は遭難してしまう…。ひたすらに街へを歩み続ける怪獣の本当の目的とは？
A kaiju appeared at a construction site deep in the mountains. Soon after, it suddenly died, but the reason is unknown!
Ayumu and her junior team member, Yuta, go to investigate in the mountains. Another kaiju of the same species appears there and chases them until they are completely lost...
Then, the kaiju begins to advance toward the city with unstoppable determination. Where is it going, and why?
