(Multiple heroines, no routines, no invincibility, no system, no brainless cool writing, similar to Gundam + Cthulhu + Eva + Pacific Rim)
In 2027, the explosion of the Monte Cristo monument that appeared out of thin air triggered the first blow. The alien wave swept the world and human civilization was on the verge of collapse. In order to counteract the catastrophe, countless dungeons were built, and the exclusive armor for women became the most dazzling symbol of the apocalypse. B21 Dungeon was accidentally ejected to the ground. 20 GM girls with an average age of less than 20 years old defended the defense line before the wave came. They lost their youth, used flesh and blood to fight against the alien torrent, used armor and faith to fulfill their mission, and clung to life in despair...
