Centuries ago, a bio-virus codenamed "t" opened the door to destruction for human civilization, sounding the horn of the apocalypse. The gate to the end times opened, countless powerful and cunning creatures began to ravage the earth, and human survival was in jeopardy! From then on, the earth officially bid farewell to the Fifth Era - the "Human Civilization Era" and entered the Sixth Era - the "Chaotic Era." This is a story that takes place in the Chaotic Era...Ant power, mantis blade, locust wings, beetle...