The identity of Aqua and Ruby Hoshino’s father is the central mystery of Oshi no Ko. The man, Hikaru Kamiki, is not just a absent parent but the primary antagonist whose actions set the entire story in motion . His complex and tragic history with Ai Hoshino and his direct confrontation with his son, Aqua, form the core of the series’ revenge plot .
Who is Hikaru Kamiki?
Hikaru Kamiki is the biological father of twins Aquamarine and Ruby Hoshino . He was a young member of the Lala Lai Theatrical Company when he met and began a relationship with Ai Hoshino . He was only 15 years old when Ai became pregnant with the twins . Physically, Hikaru bears a striking resemblance to his son, Aqua. He also possesses the same distinctive star-shaped pupils in his eyes as Ai and their children, a key visual trait in the series .
A Childhood of Trauma
Hikaru’s past is marked by severe trauma. As a child, around the age of 10 or 11, he was repeatedly sexually abused by an older, married actress named Airi Himekawa . This abuse resulted in Airi giving birth to a son, Taiki Himekawa, making Hikaru his father . The constant exploitation warped Hikaru’s personality, leading to deep-seated issues with trust and attachment . This trauma ultimately led to a violent outburst where he revealed the truth to Airi’s husband, which resulted in a murder-suicide that killed both Airi and her husband .
The Relationship with Ai Hoshino
Hikaru met Ai Hoshino at the Lala Lai theater company. Unlike his abusive relationship with Airi, Hikaru developed genuine feelings for Ai, and she cared for him in return . Their relationship became emotionally dependent, largely from Hikaru’s side, as he sought the genuine love he had been denied .
When Ai discovered she was pregnant, she made a difficult decision. She broke up with Hikaru, believing it was best for both of them and to free him from the responsibility of fatherhood at such a young age . However, to make the break clean, she lied, telling him she never truly loved him . This rejection shattered Hikaru. Feeling that the world was falling apart, his love twisted into something dark . It is heavily implied that, in a fit of vengeful despair, he leaked Ai’s pregnancy and her location to a obsessed fan, Ryosuke Kai, which directly led to Ai’s brutal murder .
Hikaru Kamiki and Aqua’s Relationship
The relationship between Hikaru and his son, Aqua, is defined by a quest for revenge. Aqua dedicates his entire second life to finding and making Hikaru pay for his mother’s death .
The Confrontation
Aqua’s pursuit culminates in a direct confrontation with Hikaru. Aqua created a movie, “15 Years of Lies,” to expose the truth about Ai’s life and death, successfully drawing Hikaru out . When they finally meet, Hikaru shows no remorse for his actions, viewing the movie as a piece of fiction . He reveals his distorted perspective, explaining that he felt only Ai could understand his pain and that her rejection drove him to have her killed . Aqua, however, sees him only as a remorseless murderer.
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The Final Act
The manga’s ending reveals the tragic conclusion of their relationship. To protect his sister Ruby from the same fate as their mother, Aqua decides he must eliminate Hikaru for good . Aqua’s plan was not simply to kill his father, but to ensure Ruby’s future remained untarnished. In their final struggle, Aqua fatally stabs himself and then pushes both himself and Hikaru off a cliff into the sea, where they both drown . Aqua’s final act was to frame the scene so that Hikaru would be posthumously blamed for his murder, making Aqua appear as a victim and protecting Ruby from any association with a killer father . In this way, Hikaru Kamiki’s role as the architect of the family’s tragedy was sealed, along with his death at the hands of the son he wronged.
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