Issei Hyoudou (Midnightverse)/Synopsis

"Our story will truly begin much like where Humanity began. In a Garden. Whether this change is good for the Boy or bad for him. We'll just have to find out won't we."

Arc/Season 1: The Special Children
Issei is first seen in the classroom waking up from a nightmare about a massive three-headed dragon destroying everything. He finds Rias and the other girls cheating on him forcing him to nearly activate the Juggernaut Drive but the crisis was averted thanks to Ddraig.

In the chapter, Alone, Issei begins to experience the adverse effects that the energy of Trihexa left on his pieces. He begins to hallucinate and experiences delirium. Tired of being tormented by the visions he was receiving, Issei, along with Ddraig, decide to remove his Evil Pieces with the help of Irina.

In Operation: KMS, Issei successfully removes his evil pieces and continues his relationship focusing nearly all of his romantic feelings towards Irina. Upon arriving home, Issei is chastised by his twin sister, Mitsuki, for not telling her that he was removing his pieces. He then hears from her of a tournament that includes the entire supernatural world.

Following Rossweisse's return, Issei, along with the others, decided to form a new group called Eden Squad. After meeting with his babysitter, Ashley, who was revealed to be the Archangel Azrael, Issei is taken to Azazel's lab for a checkup. It is revealed that Issei has miasma running through him making him a cambion but not a natural one.

Following his checkup, Issei encounters a young girl dumpster diving form food in an alleyway. He takes her to a McDonalds after coaxing her out of the alley. He grows fond of her and decides to take her to Azrael's apartment where after a while decides to take her in.

Issei and the others are then given a mission to go to America to investigate the most recent sighting of demon activity in Sioux Falls, South Dakota. There Issei and Rossweisse cement their relationship after killing a wendigo together. Issei and the others then meet up with an operative of Blacklight named Eric who takes them to the base to meet with their leader, Cornelius. Cornelius talks with Issei proposing his theory as to how the Special Children were created. After learning that they needed an Enochian Weapon, Issei returns to the underworld along with Eden Squad to inform the Satans of the situation. It is at this moment that Issei meets Ingvild Leviathan who is readily accepted into their group of misfits.

Returning to America, Issei, along with Kiba, Irina, and Ingvild, meet up with Lisa and Eric. Issei buys a 1967 Chevy Impala for him to drive. Following Lisa and Eric to Colorado, Issei meets with a man named Isran and helps him retrieve the Colt from a nest of vampires.

When returning home, Issei encounters Rias and the other girls again. Refusing to speak with her, Issei leaves the room but is attacked by Tatsuya, Rias and Akeno's new boyfriend. Issei retaliates by snapping his wrist with telekinesis. Shortly after, Issei and Irina go to the familiar forest to acquire a familiar. There Issei meets his familiar, Gore Magala. Upon hearing from her that he is being hunted by the Dragon King, Tiamat, Issei runs only to encounter her. Learning her backstory with Ddraig, Issei is forced to fight back after Tiamat starts to attack him to free her beloved. Issei fatally wounds her in self-defense. In a desperate gambit to save her, Issei uses Ddraig to transfer her soul into a gem and infused it into the Booster Gear.

After this, Eden Squad is sent to Tokyo where they encounter another Special Child and the two demons sent to hunt them. Barely defeating them, Issei tells Ichika of his status and that he has to move for his own safety.

At the beginning of the Azazel Cup, Eden Squad is pit against the God of Thunder, Thor. Using Ingvild's strategy, Eden Squad achieves a flawless victory. Their next battle was against Verethranga whom they also defeated.

Their greatest battle was against Kali. The Goddess' peerage eliminated over half of their fighters forcing Issei to enter the Abyss Dragon Drive in rage at Irina's elimination. With this mode, Issei defeated Kali.

Their next match against Set was flawless as the first match against Thor. With the finals coming up, Issei and his team are set on a two-week break. They played for the school festival as their team's disguise was a music club. After celebrating Lily's birthday, Issei and Eden Squad are sent to Germany to investigate a death linked to demons. There he met the Princes of Hell, Ramiel, Dagon, and Mammon. Dagon explains that a Faustian Demon was responsible for the death in the town. Trying to capture the demon after encountering her, Issei and his team are almost defeated and is saved by Dagon.

In the chapter, Fighter's Unknown Battlegrounds, Issei and Eden Squad face off against team Gremory, Bael, and Sitri, They are assisted by team Vali. Their match is interrupted by the demons sent to capture Issei. Beelzebub reveals himself to Issei and captures him.

Issei wakes up in an abandoned town and discovers the other Special Children including Murayama who was taken like him. Learning that they all have to kill each other and only one can survive, Issei defies this rule and attempts to find a way for them all to escape. Learning the true purpose of the Special Children as a demonic army leader from Beelzebub, Issei furthers his attempts. When Lance reveals himself as an enemy, Issei takes the other special children and begins to teach them to gain some semblance of control over their powers. After destroying the barrier, Issei sends a message to his twin for help.

After defeating Lance, Issei reunites with his friends. He is then saved by his sister from a sucker punch attack by Lance killing Mitsuki in the process.