The creators of Kaguya-sama: Love is War and Scum's Wish have teamed up to create an anime adaptation of Oshi no Ko, which will begin in April 2023. The story is set in the world of showbiz, with two main characters active in the industry, but it also contains elements of occult fantasy and suspense, and one big mystery remains. That mystery is the protagonist's father, who is said to be the mastermind behind the story. In this article, we will explore the biggest mystery in Oshi no Ko!

Oshi no Ko begins with a shocking development!!

Pregnant Ai

[Oshi no Ko] begins with the shocking development that the protagonist, an obstetrician-gynecologist, is visited by his favorite idol (16 years old) while pregnant, but then begins with an even more shocking development in which the protagonist is murdered and reincarnated as the child of his favorite idol (16 years old). The story is about the two protagonists, born as twins, who live their second lives as the children of idols.

Even more shocking developments await in [Oshi no Ko]!!

Murdered Ai

An idol who gave birth to two children at the age of 16, but after her comeback, she walks the path to stardom, and how will her husband, who watches over her, walk the second half of her life? Such a heartwarming story full of family love... did not end up. The idol who was about to make her name known to the world was murdered by a stalker, ending her life at the age of 20. The prologue of the story ends with a shocking development that drops a bomb on such a peaceful land.

Who is the murderer of Hoshino Ai?

Do you have an accomplice?

Who killed Hoshino Ai, the idol who was murdered in the prologue of the story? This is a big mystery in this work and one of the themes. The perpetrator was a college student stalker, the same person who murdered Goro, the protagonist's previous life, and committed suicide after killing Ai. However, the perpetrator was not the kind of person who would be able to find out where Ai was hospitalized or where her new home was. In other words, it was clear that someone was providing information to the stalker behind the scenes.

Is the mastermind in the entertainment industry?

Who is the informant?

It would be impossible to find out where Ai was hospitalized or where her new home was from a normal perspective, and there were only a limited number of people with both motive and means. That person manipulated the stalker and killed Goro and Ai without getting their hands dirty. The person in question was someone in the entertainment industry who was in a relationship with Ai, and it was highly likely that he was the father of the main characters Aqua and Ruby, so Aqua uses her genetic information to find that person and infiltrate the entertainment industry to take revenge.

That person was associated with the Lalarai Theater Company! ?

brute force attack

Aqua brute force unlocked the smartphone that was left behind by Ai, picked out the people listed on it, and contacted them under the pretext of appearing in a drama or a romance reality show. She then discovered that Ai's boyfriend was a member of the "Lalarai Theater Company."

Is the target of her revenge already dead?

Half-brother discovered

Aqua conducted a DNA test on people associated with the "Lalarai Theater Company," with whom she co-starred in a 2.5-dimensional stage play, and found a person whose genetic information matched hers. That person was Himekawa Daiki, the star actor of the Lalarai Theater Company. Aqua and Himekawa Daiki were half-brothers. However, Himekawa's parents committed suicide together when he was 5 years old. The person Aqua wanted revenge on was no longer in this world.

A suspicious person appears, claiming to be her father!

Suspicious person claiming to be her father

Aqua's revenge ends incomplete. However, immediately afterwards, while Ruby is visiting her mother's grave, a mysterious man claiming to be her father appears. Who is this person?

A mysterious girl appears!

Mysterious Girl②

Afterwards, Ruby discovers Goro's skeletal body, and a mysterious girl appears immediately afterwards and tells her that "Ai gave birth in secret" and that "the perpetrators are a duo, one of whom was a university student at the time and later committed suicide, and the other is a junior high school student."

Consideration! Is the mastermind still alive?

Shocking Fact

Aqua discovers that Himekawa Daiki is her half-brother, and Himekawa tells her that her parents, Uehara Seijuro and Himekawa Airi, committed suicide together and are no longer with us. In other words, the person who is the mastermind behind Aqua and Ruby is already dead... but meta-wise, there is no doubt that he is still alive. In the first place, Kurokawa Akane realizes that there is a loophole, and her father (a suspicious person claiming to be her father) has also appeared, so he is definitely still alive.

Character Profile of the Perpetrator

Ai calling

There is a scene where Ai calls him while he is alive, but it's not from his smartphone, it's from a public phone. In other words, he is a careful enough person that he doesn't even leave a trace on Ai's smartphone, so I don't think he is the kind of person who would end up like this. Or rather, it would be shitty if it ended with him being dead.

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Consideration! So why is the mastermind still alive?

The true identity of the father

First of all, there is no doubt that Aqua (and Ruby) and Himekawa Daiki are half-siblings. In other words, they are related by blood. There is no doubt that their father is the same person. The problem is that Himekawa Daiki says that a man named Uehara Seijuro is his father, but that person is already dead. If we assume that the mastermind is still alive, various theories can be considered.

The father is different in the first place

The theory is that the person named Uehara Seijuro by Himekawa Daiki as his father was not Himekawa Daiki's father in the first place. If he was only the father in terms of position, but was not related by blood, it would make sense. In that case, the double suicide becomes suspicious. If Himekawa Daiki was born as a result of an affair between Himekawa's mother and the mastermind, and Uehara Seijuro found out about this fact, it would be a motive for the double suicide. It is also possible that this was not a double suicide but a murder. The mastermind is a dangerous guy who killed two people without getting his hands dirty (three people if you include the suicide of the stalker), so it is possible that the double suicide itself was planned.

Uehara Seijuro is alive

The circumstances of the deaths were a double suicide at a cottage in Karuizawa. Nothing else is known, but if this was a double suicide with difficult methods to identify the body, it is possible that it was not Uehara Seijuro who died in the double suicide. If that is the case, it is possible that Uehara Seijuro is still alive.

Himekawa Daiki is lying

It is true that Aqua (and Ruby) and Himekawa Daiki are half-brothers. It is also true that Uehara Seijuro and Himekawa Airi committed suicide together. However, it may be that Himekawa Daiki is lying about his parents being those two. It's not impossible, but... it seems a bit unlikely.

Consideration! Who is the mysterious girl who suddenly appeared?

Mysterious girl

A truly mysterious girl who Aqua and Ruby met in the place where they were born after Goro and Sarina died. The girl said something meaningful like "I guided the two girls who couldn't find a true mother and the mother who gave birth to a soulless child," and she knew that Ai had given birth to Aqua and Ruby, and that the doctor in charge had disappeared that day. She also knew that there was a suspicious man who was about college age and a boy who was about middle school age around the hospital. She also seemed to know about Ruby. Who on earth is this girl?

Occult Fantasy Girl Theory

Since this work is an occult fantasy about being reincarnated as a favorite girl, was she a girl who knew everything with some kind of occult special ability? There is a possibility.

Theory that she is related to the nurse who appeared in episode 1

Mysterious Girl③

In a scene where there is a suspicious man around the hospital, a person who seems to be the beautiful nurse who appeared in episode 1 is shown. Could this girl be related to that nurse? In the first place, in order to know that a suspicious person was wandering around, you have to be related to someone who knows the facts. There are only a limited number of people who know the fact that Ai gave birth to the two children, the fact that Goro disappeared, and the details of the suspicious person, but the nurse meets the condition.

Is it a daughter?

The tsukkomi nurse who appeared in episode 1

The statement "I guided the two who could not find a mother in the true sense and the mother who gave birth to a child without a soul" may have been known about the circumstances at the time of birth if it was intended that "the two were born with some abnormality, but something miraculous happened and they came back to life." Also, if someone knew both Goro and Sarina well, they could have sensed the characteristics of Goro and Sarina in the appearance of the two active on TV and other media. If you think about it that way, it explains the seemingly occult statement. After all, the tsukkomi nurse meets that condition.

The theory that she is the daughter of the mastermind!

Mysterious Girl ④

There is another person who knows the above situation well. That is one of the suspicious people and the person who is said to be the mastermind. When the suspicious person who calls himself her father met Ruby in front of Ai's grave, a crow was depicted there. And this mysterious girl was also controlling the crow. There is also a theory that this girl is the daughter of the mastermind. If that's the case, does that mean he got three people pregnant, including Ai? (Confused)

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【【Oshi no Ko】】Summary of Oshi no Ko theories

【Oshi no Ko】The biggest mystery is who is the father of Aqua and Ruby. And what about the identity of the mysterious girl? Since the anime has to describe genetic characteristics such as voice actors and hair color in detail, there may be some meta-information that can be found from the anime.

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