In a strange realm within the afterlife, a band of teens called the Battlefront fight to keep the mysterious, powerful Angel from taking them to the next unknown level.
In need of more weapons, the Battlefront descends into the Guild, a subterranean gunnery where every hallway and staircase is rigged with deadly traps.
With the aid of a new member, the genius hacker, Christ, Yuri and the Battlefront decide to break into Angel’s lair and steal secrets from her hard drive. To distract the NPCs, they use the girl group Gldemo.
A replacement for the lead singer of Gldemo must be found. The manic, high-strung Yui tries desperately to assume the role. Hinata, meanwhile, seeks to avenge a mistake made long ago.
To strip Angel of her scholastic power, Yui devises a plan for the Battlefront to replace Angel’s test results with bogus ones. But they never realize the one who replaces her may be even more sinister than Angel could ever be.
When Angel is believed to be breaking scholastic code, Naoi uses this infringement to exert his growing power and places both Angel and Otonashi in a prison within the school.
Now that Naoi has seemingly joined Battlefront, Yui persuades Otonashi to let his powers of hypnosis help him recover his memories. But there are other issues at hand for the group — such as capturing the mysterious creature from a nearby river.
With Otonashi's and Angel’s newly formed alliance, dark and powerful clones of Angel have begun attacking the Battlefront with greater aggression. They must return to the trap-rigged Guild once more and risk heartbreaking, violent losses.
With the Angel clone situation becoming uncontrollable, Naoi proposes that they once again call upon the genius hacker, Christ. Meanwhile, Otonashi begins to remember his past.
Otonashi decides that the high-strung singer, Yui, needs to be pushed into finding peace and moving on. But Yui has other plans—namely to beat the boys of Battlefront in a violent game on the soccer field.
As Hinata and Otonashi talk with Naoi, something strange happens: his shadow takes an enormous, evil form and engulf him. Making matters worse, the Shadow monsters are multiplying and taking control of the members of Battlefront and the NPCs.
The Shadow monsters show no signs of stopping as more Battlefront members and NPCs fall victim to their strange, marauding power. Yuri takes a dangerous trip into the darkened Guild.