The main character, Gunvolt, controls nearly identically to the previous game, using a gun to lock onto enemies and then using his electric field in order to attack them.

He is accompanied by his girlfriend, Joule, who only exists in the form of Lumen, her own septimal projection known as "The Muse", as she was physically killed in events prior and bonded herself to Gunvolt's septima.

Meanwhile, Copen, a human scientist and warrior who harbors a massive hatred of adepts, arrives on the scene to investigate the events, as well as to search for his younger sister, Mytyl, who is hospitalized in the very building the Seraph was about to crash into.

Zonda has stolen Sumeragi technology with aims to create much more powerful versions of the Glaives, and reveals what they call their true form: a young, pink-haired girl.

Copen manages to snatch a shard from Zonda and gives chase, and Gunvolt finds one last piece of Joule has remained with him, albeit reverted to a much younger, childlike form and severely weakened in power.

The first, Gibril, is a young punk girl whose septima, "Metallon", allows her to create bladed weapons through metal, especially via hemoglobin in blood.

The second, Milas, is an environmentalist who uses his "Ichor" septima to control and freely move through water to deliver deadly attacks.

The third, Teseo, is an internet troll and black hat hacker who constantly harasses Gunvolt and Joule, and can use his "Hack the Planet" septima to digitize and destroy reality.

Gunvolt makes short work of Ghauri and returns to his apartment, where Xiao reveals that he's located Eden's fortress, the Garden, in a remote nation called Tashkent.

Copen arrives on the scene, and seeing Mytyl dead, swears to Gunvolt that he will kill every adept on the planet, starting with him.

The third, Ghauri, is a street dancer and slam poet who uses his "Prism Cataclysm" septima to create deadly crystallized weaponry.

Copen is shaken beyond belief at the notion that his sister is an adept, and Zonda uses Mytyl as a proxy to rip the power of the Muse away from Lola, transforming into a horrible demonic form.

However, they decide not to kill one another, thanks to the words of a revived Mytyl, now reunited with the essence of Joule and having regained her voice once again, but losing her memories of the two.

In Gunvolt's ending, he and Quinn are out together, when he has a chance encounter with Mytyl, who stops, puzzled, and asks him if he's an angel, echoing Joule's first words to him.

In a post-credits scene, Mytyl is shown to be happy at last, although she occasionally has dreams about Gunvolt, revealing that Joule's memories still live on in her.

[5] In December 2016, Japan released a DLC pack that contains score attacks, a song track and a speed run mode.