2061 AD. Fifty years have passed since mankind developed the Network society. It was anticipated that this new infrastructure would realize a utopia where people connected with each other at the level of consciousness. However, new social problems such as personal data leaks and proliferation of manipulated information began to surface. Nevertheless, people still relied on the Network to exchange information, and proved unable to opt to abandon it. In due course, a new Network realm with more effective security measures was developed. This was called Meta Real Network, usually abbreviated as the Metal. The Metal accommodated personal memory data within protected virtual stand-alone organic cyber enclaves called bubble shells and eventually pervaded the everyday lives of people. However, people gradually learned to release and explode their instincts within the secure environment of the Metal. The unleashed instincts pushed each individual's consciousness to drown in the sea of information and to be exposed to the pressures of desire. Meanwhile, norms and regulations continued to bind their real world lives. Thus, strange friction between the two worlds began to manifest themselves as aberrations beyond the bounds of the imaginable. Experts who challenged the deep sea of the Metal to investigate and decipher such aberrations were called cyber divers. This is a story of a cyber diver, Masamichi Haru, who investigates the incidents that lie between Reality and the Metal. (Source: Production I.G)

Cheng Ke has lost everything. Coming from a privileged background, he now has to search through trash to find his missing possessions. When one of his frustrated outbursts results in him being punched in the face, Cheng Ke finds himself unfortunately acquainted with terrifying gang leader Jiang Yuduo. Circumstances lead to Cheng Ke becoming a tenant at a new apartment—which just so happens to be rented out by Jiang Yuduo. Cheng Ke's inability to complete even the most menial tasks forces him to overly depend on his landlord, and as a result, the two form an indescribable bond. However, there are darker forces at play in the lives of both Cheng Ke and Jiang Yuduo. The two men are haunted by the pasts they left behind, and meanwhile, danger lurks around every corner. With mysterious figures following their every move, gang wars raging in the streets they walk on, and enemies itching to bring them down, Cheng Ke and Jiang Yuduo must always have each other's back.

Toto has been dreaming about adventuring with other people for as long as he can remember. Despite his hero title, he still remains without allies due to his timid personality. Therefore, when three women: Ciel, Anemone, and Goa suddenly request to join him, Toto is overjoyed. Unbeknownst to him, they are all assassins assigned to eliminate him! While Toto resolves to protect his would-be killers, the women fight over who can finish off the hero. As Toto remains oblivious of his new party members' true intentions and finds himself passing out every time he gets flustered, the four of them embark on their peculiar adventure into the greater world.

One fateful day, Youtarou Misaki is rescued by a man named Arashi Mutou from drowning in the sea. After getting him to dry land, Arashi wakes Youtarou up and asks for his name. Youtarou's memories quickly surge back, but instead of telling Arashi his name, he decides to lie and act clueless about his past. Arashi nurses Youtarou and lets him temporarily stay at his diner, Kurage no Shokudou. Despite his hospitality, Youtarou continues to insist that he has no recollection of how he ended up drifting across the sea. How will the fake amnesiac go on with his life now that he has abandoned his family and home?