In the Apocalypse, I Use My Mecha to Hold Back the Sky

In 1111 AD, a huge meteorite fell on Blue Star, sinking an island nation and bringing about a horrific disaster. Countless monsters appeared one after another from the sunken island country, and humans began to fight against the monsters... Before the development of science and technology, human beings were retreating steadily. Facing the terrifying monsters, they could only build a great wall of flesh and blood with their lives to compete with them... In 1894 AD, it took nearly eight hundred years to finally quell the monster attack, but a second wave of monsters ushered in. The growth of monsters plunged the entire human race into an unprecedented crisis... In 1945 AD, mankind tested and produced the first atomic bomb and put it into use. The situation of the war took a turn for the better. With the help of the atomic bomb, another round of attacks by monsters was withstood... In 2000 AD, a third meteorite fell to the same place, Al The French virus broke out, the previous monsters began to mutate, the war situation became more tense, and mankind was at a critical moment of life and death. In 2008 AD, the Dragon Kingdom's military studied the corpses of monsters and discovered a shocking secret... In 2021 AD, mechas are fully put into use, and all people have the opportunity to put on mechas and go into battle to kill the enemy. … (Note: The above time points have nothing to do with real history. They are purely fictional and do not disrespect history.)