Hiroko

Further investigating the upper floors, they are shocked to discover that the one responsible for the disgusting state of those people was none other than Gimmel, the real Gimmel, as he reveals to them that the Arcadia that Aleph witnessed before was nothing more than the fabrication of virtual reality, and thus, not real, simply an illusion under his control. Aware that Gimmel would not let them leave that place alive, not now that they knew the truth about his fake utopia, the two engage him in battle, where Gimmel is killed, and his false world of delusions and lies, destroyed.

Once reunited with Zayin, he explains to them that his first priority is the rescue of the innocent workers who, according to him, are being forced to labor in the Factory area against their will. They all rush to the camps, but are perplexed to find out that none of the workers, some of which are even children, want to leave their cells (much like Hiroko once did), indifferent to the inhuman conditions they have been toiling under all this time. Knowing that something is clearly wrong, Zayin suggests that they invade the Factory's watchtower, whose last floor was being guarded by the demon Belphegor, who almost succeed in mortally wounding Zayin.
After Aleph and Hiroko finish off Belphegor, they proceed to uncover the Factory's disturbingly dark secret: in the top of the tower, a demon woman named Siren is singing a sorrowful melody which is hypnotizing the laborers into mindlessly working until utter exhaustion and death on the fields. Discovering however, that she wasn't to be blamed for her actions, and that the music was only her way of mourning the loss of her lover, from who she was taken away from by the Center's men, Aleph and Hiroko decide to finish what Hanada once started: with the dolls he once utilized in their hands, along with another one that wasn't originally in his possession (and was the main reason for the failure of the ritual at the slums of Valhalla), they successfully manage to open a gate that leads directly into the Abyss, where they start looking for Siren's long lost lover, hoping that by reuniting the couple, she would stop her singing.
However, in the middle of their search in the plains of the Abyss, Aleph and Hiroko experience a bizarre phenomenon: a "spacial distortion" of sorts teleports them into the inwards of a mysterious building where, on separated chambers, they find people tied to metallic chairs, their brains plugged into computers.

Not wielding the great strength he once had, a temporary consequence of the rebirth process, Masakado's current power is unable to let him do anything more than just removing the giant boulder that was put in the way of the cave's entrance; as such, Aleph and Hiroko are the only ones who can free the gods of the Amatsukami now. Once they manage to do it, they are deeply thanked by both Hiruko and the sun goddess Amaterasu herself. Leaving for the Diamond Realm, a celestial plane where the Amatsukami intend to heal from their wounds, Aleph and Hiroko are left once again where they started. But this time, they made up their minds: they shall go back to Holytown, join Zayin in his quest for true justice, and storm the Center's headquarters once and for all.

Desperate to amend his past mistakes, where he foolishly betrayed the Amatsukami clan of Japanese gods (and Masakado himself) when he allowed the Kunitsukami, allied with the Hebrew God, to defeat and imprison them, Hiruko begs Aleph to retrieve his master's body parts, which were torn asunder when he tried to mediate the conflict between the two opposing groups, and were taken away by the Kunitsukami not long after they were equally sealed away by the same gods they had aligned themselves with before.
With the help of Hiruko, the doors of different shrines scattered through the Underworld are opened: there, Aleph and Hiroko meet some of the Kunitsukami, who after fighting or being helped by him, grants the duo the parts of Masakado's body they were holding. Then, after discovering the location of Masakado's missing decapitated head (who was in possession of a digger in Holytown who wasn't aware of its true value), and fusing it all together with Masakado's soul (that Hiruko had with him all along), Aleph and Hiroko finally revive Masakado, who, after thanking them, proceeds to teleport himself, and Hiroko, to a sealed grotto in the Underworld, where the Amatsukami are being held.

After Aleph forces Puck to give him the "Infidelity Sap," and is helped by Oberon (the king of the faeries, and the benevolent ruler of Shinjuku) to break the spell on Hiroko, Daleth is the next one to suffer from the effects of the sap, falling deeply in love with Hanoun (who, since the beginning, also loved him). After these events, Daleth finally abandons his grudge on Aleph, deciding to live in Shinjuku, alongside Hanoun, in order to help the fairies there make their lives easier. He also explains that the "Mars Pillar" Aleph picked up in one of their previous battles is, in fact, one of the seven ancient artifacts needed to open a passage to the Abyss. He gives them a hint of where they can find the next Pillar, and then they leave, resuming their exploration of the Underworld.
Next stop is Akasaka, a city under the dominion of the Jirae, hardworking demons (and even some humans) who earn a living by excavating precious weapons and other items from ages past in a nearby site, and selling them to clients of the surface. And lastly, Aleph and Hiroko reach the town of Roppongi, an area which has become the last refuge of the "mutant community," a group of humans who were grotesquely disfigured by the toxic radiation that affected the Earth after the nuclear war, and were cast out by the Center for this; forced to forever live out of the reach of the sunlight.
After meeting with the Mutant Elder, and hearing his story, Aleph and Hiroko are then introduced to Hiruko, who serves as an attendant of the powerful guardian of Tokyo, Taira no Masakado.

Once the "wheat has been separated from the chaff," Millennium will be destroyed, exactly like Valhalla was. Finally, Zayin reveals that the Factory is nothing more than a concentration camp, where people are forced to work against their will. By exposing the true agenda of the Center to the people, Zayin hopes to incite them into action, so that they can together stop the machinations of the Center and fix the corrupted system that is governing Tokyo Millennium.
Divided by doubt on which side to align themselves with, Aleph and Hiroko befriend a mysterious blond man on Holytown's bar, who introduces himself as Louis Cypher. According to him, Abaddon's body can be found hiding somewhere on the Underworld, far below the depths of Tokyo Millennium, and the reach of the Center's influence. Hearing this, they decide to travel once again there, traversing through the multiple different layers of the underground ruins of what once was the original metropolis of Tokyo, encountering its various residents and gradually discovering how truly grim is the way that the Center treats those who are not considered worthy before their eyes.
First, they have to fight Daleth once again, now in the dungeons of the sunken city of Shinjuku. Unbeknown to them, Daleth has come up with a new plan to use a love potion on Aleph (manufactured by a prankster fairy named Puck) in order to make him fall in love with Hanoun (a timid fairy girl who is the owner of a drug shop in the area), which Daleth hopes it will put his enemy out of commission once and for all. The plan backfires however, and the love potion ends up hitting Hiroko instead, who then starts to comically chase Daleth around.

Back to the Madam's mansion, they find Zayin, also a member of the Temple Knights, waiting for them. He escorts Hawk, who is revealed to be named "Aleph," and Hiroko, back to the Center's headquarters, where Hiroko is harshly reprimanded by The Center's Bishop for acting without the Center's consent. She thanks Aleph for his help, and leaves, guided by two other Temple Knights.
Later in the game, it is revealed by Mekata that Hiroko was taken prisoner by the Center for leaving her duties as a Temple Knight on her search for the lost boy that she mentioned earlier. After traversing through the Underworld's dungeons, Aleph finds her inside a cell in the labor camp located under the Factory district, but he has troubles in getting her out due to a psychotic trance in which was mysteriously induced in her. It is only when Nadja, a demon girl that guided Aleph through the camp's mazes, fuses herself with Hiroko, in order to restore her senses, that she finally comes back to her usual self, joining Aleph for good in each other's quest for answers.
Since Mekata would only be willing to respond to Aleph's questions if he were alongside Hiroko, the two of them decide to arrange a new meeting with the scientist, who was hiding in Valhalla's slums. But, once there, they once again meet with Zayin, and are shocked to learn that the Center has dispatched a gargantuan demon named Abaddon to swallow up all of Valhalla. Utterly disgusted by the Center's actions, Zayin, labeled as a traitor, stages a revolt, taking over the local broadcasting of Millennium's News Network and informing the people about the true purposes of the Center: according to him, the world of the Millennium Kingdom that the Center wants to create is in reality only for a limited number of selected people. The ones who are not chosen are cruelly cast aside, just like the citizens of Valhalla (who chose the pleasures of a free life over servitude under the Center's commandments).

Once there however, they discover that not only the Madam isn't aware of Hanada's whereabouts, but that she is also under his pursuit: she asks for Hawk's help in the matter, so both he and Hiroko, along with the Madam's "pet demon," a powerful Cerberus, venture into the dangerous slums of Valhalla, where they think Hanada is taking refuge. According to the Madam, the mad scientist's plan is to open a gate to the Abyss, which is confirmed as truth by the two when they finally manage to track him down, fighting a Mercurius that he foolishly summons after successfully creating his aforementioned portal (being betrayed and murdered by it in the process, after the latter ignored his commands).

Hiroko initially meets Aleph, the protagonist (who, at the time, answered by the name of "Hawk"), upon requesting his aid as the newest Champion of Valhalla's Colosseum. Hiroko is a citizen of the Center, a privileged district of the city, and also a member of the acclaimed Temple Knights, the most sacred and powerful order of warriors under the service of the government. It's her aim to find a "missing little boy" who had disappeared from the Center's headquarters after an explosion that took place six months before the events of the game, and which she believes was orchestrated by two renegaded scientists named Mekata and Hanada. According to Hiroko, Hanada is hiding in the property of Valhalla's ruler, a woman who attends only by the title of "Madam," so she plans to accompany Hawk, in order to gain entrance to the heavily guarded mansion, due to the fact that the Madam is well known for requesting meetings with the winners of the Colosseum's tournaments, in order to congratulate them for their victory.

Hiroko is the default name of the main heroine in Shin Megami Tensei II.
She is introduced as a citizen of the Center, and a member of the infamous Temple Knights; with a mysterious past that, unbeknown to even her, irrevocably tied her own destiny with that of Aleph.