Years ago, in Japan, a certain city was founded with good intentions in mind, however, those intentions have crumbled, corrupted, and were obliterated. Now all that remains is a city, Nightfall City, controlled by the underworld that calls itself 'the Night'. With the city in control of the Night, many things changed. The police became unreliable, crimes were committed every day in front of everyone, people are being treated as mere insects, and experimentation took a dark turn. A lot of people 'rebelled' and so, a lot of people died. People have to adapt, throw away their morals in order to achieve their desires, forget about anyone else, and only think about your own well-being. to accomplish those desires there are many different paths people have taken. One thing, however, has always stayed consistent: There aren't heroes in this city, just villains.

Three are each about to head into this underworld in order to accomplish their desires and fulfill their ideals: Gako Shinri, Nobutoshi Mirai, and Katsuo Mirai. Gako Shinri is a police officer with a strong sense of justice who was oblivious to the darkness. Nobutoshi Mirai, a man molded into being the number one assassin of Nightfall City who wants to live a normal life with his younger brother and childhood friend. Katsuo Mirai, the younger brother of Nobutoshi who intends to destroy the Night for his selfish desires, his benefits, his vengeance.

Who will reach their desires? And who will be forgotten like a squashed insect?