So, What the Hell Is a Man Who Is Reborn as a Shipbuilder? !

In the year 2021, a giant beast that has never been discovered by humans suddenly appeared in the sky, ocean, and no-man's land across the continent. They look different from any species known on the earth, and are full of hostility to humans. Because every time this giant beast appears, it will definitely bring disaster to humans in the area, so humans uniformly named this giant beast-"Disaster Beast" The skin of the disaster beast is abnormally strong. If you want to completely kill the anomaly, even HD will be restricted when facing it... Humanity is retreating steadily. Just when mankind had only three million kilometers of land left that had not been eroded by disaster beasts, a huge meteorite suddenly fell from the sky, bringing a brand-new energy and material to mankind. Humanity was pleasantly surprised and immediately started researching it. When the territory was only less than one million square kilometers, the first land-based Keerer was finally built and made quite satisfactory achievements on the front line against the "disaster beast"... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.