Hyakuya Orphanage Family

The Hyakuya Orphanage Family refers to the children that Yūichirō Hyakuya and Mikaela Hyakuya lived with at the Hyakuya Orphanage in the Seraph of the End series. Within the manga, there are various unnamed orphans forming a part of the group. Within the anime, members of the family have names revealed.

The director of the orphanage had a policy that everyone there was family, so members share the same Hyakuya name after the orphanage, yet the children are not biologically related to one another.

They were neither formally adopted when they were captured by vampires after the apocalypse event and so are not adoptive siblings. However, they maintained that they were family and continued to live together in the vampire city, Sanguinem, underneath Kyoto. There and beyond they would uphold that they were family.

Story
When Yu was brought to the orphanage, at least three boys, two with dark hair, and one with light colored hair, were playing around Akane and Mika. Inside as Yu was being introduced, a group of children including Ako regard the unsociable appearing Yu with unease. Standing behind Mika as he does the talking, two orphans are clutching his clothing.

After Mika has detailed his background on how he was orphaned, the children are collectively keen to share their stories. Enthusiastic, one mentions how they have never met their parents where another states their mommy and daddy killed themselves. Yet another shares how their parents left them at the orphanage. When Mika announces how none of them are sad because today, they have a new big brother named Yu the orphans storm him in an embrace.

Seeing that the director has fallen, orphans urgently ask whether she is okay. As the apocalypse event is underway it is announced by Krul Tepes who leads an army of vampires that children under the age of thirteen have been spared from the virus. Children are gathered around the director, and two hold onto Yu in fear at the apocalyptic world outside.

Having lived underground in livestock clothing for four years, orphans living together are at the table waiting for Yu to arrive for dinner. Happy to see him, it is commented how Yu is late. Asking Yu to guess what, they detail how Akane said she had curry as a surprise. Having been a long time since they had something this nice, the children are pleased. Orphans are sleeping in the same area when Mika returns home. From Mika's words, the kids believe everything Yu said about beating the vampires.

The family members join in an escape plan arranged by Mika, Yu and Akane. The sizeable group reach the exit, undetected by vampires. After Mika says they are not livestock anymore, and is in fact a genius, orphans are happy to announce that they are also geniuses. Before they can head on their way to depart, the children find vampire noble, seventh progenitor Ferid Bathory at the doorway.

Addressed as little lambs, an orphan is swept off their feet by Ferid. Having blood consumed, the child is dropped to the floor. Told the map is real and they should run, the orphans attempt to reach the exit. The orphans are all murdered by the supernaturally strong vampire aside from Yu. They are remembered when Mika sees how Yu called them family.

Although not seen alive again, the Hyakuya orphans are both remembered and commented on. They are referred to as seraphs by third progenitor Krul Tepes and the Hyakuya Sect was revealed as a cult where abandoned children were experimented on.

Orphans including Akane are visualized by Asuramaru who presents the scene of them deceased to Mika. They were used to exploit Mika's deepest fear that he is too weak to protect his family and that he would be blamed for their deaths. Illusionary members of them have been created by the being imitating Yu who are woken up by him with the alert that they have to run away. One is happy to see Mika enter the room, then a girl in her futon sees him raise a knife. With the scenario clear she screams. They lie still on the floor of the room.

In Yu's memory that Demon Mika is accessing, orphans are seen deceased in the Sanguinem exit hall. They are also shown when Yu learns that he and Demon Mika share the same deepest wound in their hearts. They remain while the memory of young Yu engages with Mika, as Demon Mika tells Yu as he is presently that he remembers his name but not who he is. At least five children with Akane are visualized in Sanguinem when Yu is detailing to demon Mika how they have more family.

Having been transferred from Ferid's mansion at some point, the Hyakuya orphans were relocated to an underground facility in Akihabara. On the fifteenth floor underneath a building, they were among many other coffins spread out in a large spacious room which also contained others such as Mitsuba's parents. Possible that their bodies were handled to be placed in new containers with pipes connected in their new setting here, everyone was seen to have been there by Yu and Mika, the latter who was now a demon.

The orphans potential resurrection was at hand where Guren believed that a spell involving seven sinful keys, and the lives of every last vampire could be used to restore humanity. They are referred to by Guren who wants to bring the orphans kids back to life where he favors restoring the fallen humans. Additionally, they are mentioned by Mika who is also in favor of bringing them back. Their fate is influenced by one of their members, Yu, who is prepared fight for the chance to have Mika become a human instead.

Mentioned by Mika, whether Yu is okay with abandoning the kids who died is asked. To encourage Yu to resurrect them rather than restore himself, Mika frames it as Yu giving up on the kids should he go ahead with what he wants. Where Mika feels their deaths are his fault, he phrases it as Yu saving his heart if he brings the kids back. Not desiring to change back from a demon at all, the orphans being saved and brought back is favored heavily by Mika.

The kids are mentioned by Yu as the family who took him in. Having them brought back is in Yu's mind via a different method of resurrection. When Yu is discussing with Mika how they will save everyone or die together, a same goal as way back when, at least seven orphans are pictured as leaving for the exit of Sanguinem.

When a memory of ancient Greece is being accessed by Yu and Mika, they find they have appeared as children which is felt to be based on a desire to go back to when everyone was still alive. Akane and two members of the Hyakuya orphanage family are remembered happy in Sanguinem.

In the Sea of Trees around Mt. Fuji where Yu and Mika are located, an orphan is visualized being murdered by Ferid. That Akane and the kids remain deceased factors into Yu and Mika's decision to re-commit to resurrecting them given the existential crisis they have endured having checked memories of the ancient past that linked them to Mikaela and a homunculus named Yu. While Mika is progressing to becoming a full demon, that the orphans can be helped influences him and Yu to embark on a campaign to acquire the seven sinful keys.