Hero Party

The "Hero Party" (パーティー) was a group of students from Earth who were summoned to Tortus by Ehit to aid humanity in its fight against the demons by training themselves for it. Hajime Nagumo was once a part of the "Hero Party" until Daisuke secretly attacked him inside the Great Orcus Labyrinth and as a result his falling into the Abyss. While suffering, he mutated into a human/monster hybrid by eating the monsters meat and absorb their powers and as a result. Because of this, he is no longer a human anymore. Due to Hajime learning the truth about Ehit's true nature from the Liberators that they are pawns to Ehit's game of death, he loses all faith in Ehit and decide to kill him if he stands in his way. Hajime later decided to warn Aiko (when they reunited in Volume 3) about Ehit's real nature, because he believed that Kouki and the others would go against him later.

In Volume 4, after his reunion with his classmates inside the Great Orcus Labyrinth and when he killed Cattleya, Hajime cut his ties within the "Hero Party" but he let Kaori Shirasaki (who has feelings for him since she first saw him at middle school) join his party on her request.

In Volume 6, after Eri and Hiyama's betrayal, Hajime decided to share his information what he had learned about Ehit with the "Hero Party" after the truth was exposed by Aiko Hatayama and Liliana S. B. Heiligh.

In the aftermath of the Demon Invasion, the "Hero Party" learned that while they are protecting humanity against Garland, this was just merely a setup by the manipulation of Ehit. This caused the "Hero party" to renounce their loyalty to Ehit and swore to kill him to free Tortus from his influence by forming an alliance with "Hajime's party" (which is fragile when Hajime and Kouki's dislike for each other due to Kouki's delusions) to unite themselves against a common enemy by clearing the remaining Labyrinths.

Due to their unsuccessful missions of failing to clear the Great Labyrinths from Kouki's empty idealism and delusional pride, the so-called "Hero Party" was considered to be the weakest Party.

After returning to Japan, the "Hero Party" is no more, because all of them joined the Returnees after they return to Earth.

Main Members

 * Kouki Amanogawa (Leader)
 * Ryutarou Sakagami
 * Shizuku Yaegashi
 * Kaori Shirasaki (Formerly, defected when leaving the Party to join Hajime Nagumo's party due to her love for Hajime since middle school)
 * Hajime Nagumo (Formerly, defected to pursue his own goals of returning to Earth due to learning the truth about Ehit)
 * Suzu Taniguchi
 * Eri Nakamura (Formerly, defected due to betraying the Party to Garland and Ehit; Deceased)

Nagayama party

 * Jugo Nagayama (Leader)
 * Kentarou Nomura
 * Kousuke Endou
 * Ayako Tsuji
 * Mao Yoshino

Hiyama Party/Bastard Four (Disbanded)

 * Daisuke Hiyama (Leader, defected due to siding with Eri Nakamura; Deceased)
 * Reichi Kondou (Deceased)
 * Yoshiki Saitou
 * Shinji Nakano

Ai-chan Defense Force

 * Yuka Sonobe (Leader)
 * Nana Miyazaki
 * Atsushi Tamai
 * Taeko Sugawara
 * Akito Nimura
 * Noboru Aikawa
 * Yukitoshi Shimizu (Formerly, defected due to siding with Reiss; Deceased)

Allies

 * Hajime Nagumo and his party
 * Heiligh Kingdom
 * Meld Loggins (Deceased)
 * Templar Knights
 * Liliana S. B. Heiligh
 * Haulia Tribe
 * Dukedom of Ankaji
 * Verbergen
 * Dragonmen Tribe

Enemies

 * Garland
 * Freid Bagwa (Deceased)
 * Daisuke Hiyama (Traitor; Deceased)
 * Eri Nakamura (Traitor; Deceased)
 * Noint (Formerly - now Netemp)
 * Hearst (Formely - now Etemp)
 * Ehit (Deceased)
 * Ehit's True Apostles (Deceased)