Mountains and Seas Are Changing, Civilization's Defense Line: Codenamed Four Symbols

The seals of the mountains and seas collapsed, and strange beasts reappeared in the world according to the level of disaster. The first level slaughters neighborhoods, the second level destroys cities, and the third level causes chaos in a country. The fourth level aims to end the era. "Xiang Liu" pours poisonous blood and melts continental plates; "Kui Niu" thunders with war drums and shakes the global power grid; "Candle Dragon" opens its eyes to day and closes its eyes to night, and its will is rewriting the laws of the planet. The top three of Qinglong, Suzaku and Xuanwu have reached their limit. Humanity's only chance of winning is to find an adapter who can pilot the ultimate weapon "White Tiger". But will he/she be the savior... Or the switch that restarts civilization? I don't like procrastination and I hope to finish the short story during the winter vacation.