The Story of the Invincible Amao's Expedition

Weird and unknown technologies that shine as if they are magic, mixed with old-age science that is old but no one has yet seen the whole picture. It can be called a variety of weird living and non-living things. Weapons and flints that are so strange that people know nothing except how to use them appear in this world at the same time. It is like a dream world, a familiar background in my memory. I don't know when my world has left me.