Mirai Kimizuki

Mirai Kimizuki (君月 未来) is the younger sister of Shihō Kimizuki in Seraph of the End. She was infected with the apocalypse virus despite being a little girl and was being treated in a hospital. Shihō joined the Japanese Imperial Demon Army in order to gain access to the military resources that were needed to cure her as the virus could not be treated in civilian hospitals. It would transpire that Mirai had been subject to seraph based experiments which would culminate in her body hosting the Fifth Trumpet.

Human
Mirai is a young girl with long reddish brown hair, reddish-pink eyes and she has purple curse marks from the Apocalypse Virus on the left side of her face that fluctuate with her current state of welfare.

She is often shown wearing a hospital gown.

Seraph
Mirai no longer has the curse marks on her face, as the Fifth Trumpet her eyes are dark with peculiar markings on her irises, and sports two pairs of large feathered wings. When Abaddon possess her, the demon manifests in a giant dark figure with many wings and an irregular form behind her. She is still in the hospital gown and is barefooted.


 * Anime: The curse marks remain and increase.

History
Before the apocalypse, Mirai lived a normal life with her parents and older brother, Shihō Kimizuki. At some point, she and Shihō were experimented on by the Hyakuya Sect to become weapons of mass destruction known as the "Seraph of the End" to destroy the world. Guren knew of this beforehand, thanks to intel provided by Mahiru eight years ago. That tragic night, the Apocalypse Virus got released on Christmas 2012, killing her parents and becoming infected herself, even though she was a little girl, forcing her brother to take care of her.

Three years later, in 2015, Mirai fled with Shihō, though he had to carry her due to the Virus making her too weak to move, thus making things difficult for her older brother over time.

Second Shibuya High Arc
Mirai debuts when Shihō and Yu (due to being handcuffed to each other) leave in the middle of their exam to come see her in the infirmary. She is being tended to with a combination of medical technology and spell tags to mitigate the effects of the curse. The healthcare provider informs Kimizuki that she pulled out of danger this time, but the treatment available to civilians is not enough. Kimizuki tells him that soon he will be in the Moon Demon Company and will be able transfer her to an army hospital.

After they leave, Kimizuki blames Yu for letting his grades drops which affects in ability to enter the Moon Demon Company and because of that, Mirai would not be able to be saved. Yu tells him to not give up on her and Kimizuki soon thanks Yu for letting him be able to be there with her when it counted.

Nagoya Arc
Mirai reappears again much later in a Demon Army helicopter, she screams about pain while scientists watch and observe her.

One orders an increase in dosage which another scientist tries to protest. The one from before says that it's fine as Kureto Hīragi gave him the order to increase the medicine dosage. Mirai begs for them to just kill her before receiving an injection which causes her immense agony to the point of pleading for her big brother while also causing the curse marks on her face to disappear. Two pairs of feathered wings then erupt from her back as her screaming stops. She is next seen where she erupts from a Moon Demon Company van and floats in the sky with four large feathered wings and a single long trumpet before her. In this form she curses the sinners and says ruin will fall down upon them. Kimizuki recognizes her, shocked and horrified.

Chains erupt from the remaining van and pierce through Mirai, making her scream in pain as a magical circle appears behind her. While Kimizuki is enraged, Guren stabs him from behind and tells him to hold still because they have not yet offered enough blood to control Mirai.

Up above, a black aura appears from Mirai's back. The soldiers announce that the fifth trumpet is transforming into an angel of destruction to smite mankind. Although they have not offered enough sacrifices yet, they have achieved the proper state, and Kureto's subordinates claim they are successfully controlling a Seraph of the End. He orders Aoi to feed the rest of the sacrifices to the demon Abaddon to stabilize it. The demon's power rushes out and consumes both nearby vampire and human soldiers while they look up in horror.

The demon becomes fully stabilizes but a few moments later, Yu awakens in his Seraph form and destroys Abaddon's manifestation.

Post-Nagoya Arc
When Kureto and Guren invade Sanguinem, Mirai is with them and the army in her Seraph form.

Osaka Arc
When Kureto returns to Shibuya, he tells Aoi to prepare the seraph to take over. She is then used to attack Shibuya to aid Kureto's coup. After, she has Abaddon blast the building Kureto and Tenri are fighting in, which leads to Kureto's victory over his father. Mirai is then commanded to blast the mysterious winged-being that appeared immediately after Tenri's death, and Mirai is down to a single pair of wings instead of the two she had since her transformation.

Shibuya Arc
Whilst Shibuya comes under attack by the Hyakuya Sect, Mirai is kept within a room and injected in the neck with a drug. This was on Kureto's orders to activate her as a seraph and she begins reacting just as Kimizuki arrives in the room. Holding her face she cries out as seraph wings emerge from her back.

She stands with four seraph wings not reacting to being in between Saitō and Shikama Dōji who has possessed Shinoa's body. Remaining still when he reaches towards her, she has her eyes closed as she is taken by Kimizuki who escapes whilst Saitō distracts the first.

Carried unconscious on her brother's back, Mirai does not react to the ruin occurring in the city, neither when she is stabbed through the chest by Guren. After being dropped to the ground, a sinful key erupts from Mirai and her seraph wings have disappeared.

Now carried by Yoichi, she is still unresponsive as he finds Shinoa and Mitsuba. Mirai is mentioned by Kimizuki, when driving with building rubble falling around, her protection takes priority over everything.

Post-Shibuya Arc
Mirai's deceased self has been transported away from Demon Army territory. Kept in a refrigerator there are no signs of degradation which Kimizuki speculates is due to all the experiments she went through.

Akihabara Arc
Transported on a vehicle driven by Ferid, her body lies near Kimizuki as they travel to a location that Guren states is one where no one can find them. Arriving at Akihabara, it is presumably Mirai who is taken to the fifteenth floor underground. Covered in a blanket, Mirai is carried by Kimizuki. Concerning Mirai, the price for human resurrection is seven sinful keys, and the lives of every last vampire offered as sacrifice.

When Yu in a demonic state of fury has been restrained by his squad, Mirai is mentioned by Kimizuki as also being a part of his family in an attempt to return him to his senses.

Experimentation
Seraph of the End: As the 5th Trumpet, Mirai possesses great power that can be felt when she blew into her trumpet, and while the extent of her power has yet to be shown, she seems to be powerful enough to fully invade a vampire city. Her trumpet also served as a way for Kureto to summon the demon, Abaddon.
 * Abaddon: The demon Abaddon is summoned and able to manifest through Mirai.

Shihō Kimizuki
Mirai's elder brother, Kimizuki has taken care of her since she was afflicted by the apocalypse virus in 2012. Since she was unable to move on her own and they had to avoid both the Horsemen of John and the vampires, this was very hard on him. Mirai reportedly told those who he was with that she wanted to die, and they tried to get Shiho to kill her. Kept alive when Kimizuki refused, Mirai and him at some point were taken to Shibuya. In 2020, Mirai was receiving professional care and her medical bills were to be covered when Kimizuki became a member of the Japanese Imperial Demon Army's Moon Demon Company. Caring greatly for her brother, it is him who Mirai calls out to while she is being experimented on. Although unconscious, Mirai would be carried by Kimizuki when he escaped with her as Shibuya came under attack. When Mirai was murdered by Guren, she was kept with Kimizuki where it was possible she could be resurrected.

Japanese Imperial Demon Army
The Japanese Imperial Demon Army is the largest military organization in Japan. Although Mirai's medical care was covered by the Moon Demon Company branch organization, evidently she would be transferred to be experimented on by the army. During prolonged experimentation, Mirai would be used as a host for a seraph. Activated as a weapon, Mirai's body would be used by the Demon Army to sack the vampire city of Sanguinem. Another major happening was Mirai being deployed in the coup where Kureto overthrew his father, Tenri.

Kureto Hīragi
Merely a test subject to Kureto, she is seen as little more than an experimentation. With the Fifth Trumpet within her, Mirai would be used as a decisive weapon in Kureto's plans of action.

Guren Ichinose
The seraph within was energized by Guren, the commander of the Moon Demon Company, who provided blood to it. Her body flying overhead, Mirai would be above Guren as he fought alongside Kureto when they invade Sanguinem. With Guren having become a demon, one acting to betray everyone, Mirai would be murdered by him. Stabbed through the chest in Shibuya while she was unconscious, the sinful key that came out of Mirai would be taken by Guren.

Aoi Sangū
A test subject to Aoi, her experimentation is monitored by this aide to Kureto. As the Fifth Trumpet, she has her body act in accordance with Aoi's directions.

Yūichirō Hyakuya
Unknown to her, it was Yu who persuaded Kimizuki to see her during his exam when Mirai's health took a turn for the worse. When under the control of the seraph, Abaddon, above Mirai would be destroyed by the seraph within Yu. Both having it in common that they are seraphs, Mirai would be the first one seen, with Yu the second.

Quotes
"AAAAAAAAAAAAHHH!!! Stop!! It hurts!! Please!! I can't take any more!! The pain...!! I hurt all over!! Stop... Kill me... Please, just kill me... Eep... AAAAAAH!!! Help me!! Big brother!! Big brother!! Help me!!! AAAAAAAAAAAAAAAAH!!!!"

- Mirai to Kureto's scientists.

"Wretched sinners. Ruin shalt fall down upon thee."

- Mirai in her seraph form.

Trivia

 * The name Mirai means "future" (未来).
 * Mirai's surname Kimizuki means "lord, noble" (君) (kimi) and "moon" (月) (tsuki/zuki).
 * Despite being younger than 13, Mirai was infected by the same virus that killed those 13 and older during the Apocalypse that Shihō Kimizuki took care of her until he entered the safety of the JIDA.
 * Even though Mirai is shown covered in ofuda in the manga, the ofuda do not appear in the anime.