Hikaru Kamiki/Relationships

Airi Himekawa (Victim #1)
It is implied that Hikaru was molested and raped by Airi Himekawa when he was eleven, and ended up getting her pregnant, resulting in Taiki Himekawa's birth and getting involved in a murder-suicide with her husband Seijuurou Uehara after he found about it.

Airi was possibly the reason why Hikaru became the psychopathic, insane and sadistic killer that he is today.

Gorou Amamiya (Victim #2)
Hikaru gave information to an obsessive fan named Ryosuke about Ai Hoshino's pregnancy. With this information, Ryosuke found out that Gorou was the doctor to help Ai give birth, resulting in Ryosuke pushing Gorou off a cliff, although it is implied Gorou's death was not planned, since the person Hikaru mentioned to the Ryosuke was Ai, not the doctor.

Ai Hoshino (Victim #3)
Ai is Hikaru's third victim (after the death Airi Himekawa) whom he had a secret relationship with to the point that they slept together before they ended their relationship.

After breaking off their relationship, Hikaru unknowingly found out that Ai was carrying with twins (Aqua Hoshino and Ruby Hoshino) and he sent an obsessive fan named Ryosuke to murder her on the day of her dome concert.

Yura Katayose (Victim #4)
Yura is Hikaru's fourth victim who became drinking buddies before her demise when Hikaru presumably pushed her over a cliff.

Taiki Himekawa
Taiki is Hikaru's son through the married actress Airi Himekawa. Taiki however is unaware of Hikaru's existence and believes he is Seijuurou's biological son.

Aqua Hoshino & Ruby Hoshino
Aqua and Ruby are Hikaru's twin children through Ai Hoshino. Although they don't know each other directly, Aqua hates him with all his strength and wants to kill him at any cost to make him pay for everything he's done. Ruby does not know of his existence, but knows that there were two people responsible for the death of Ai and Gorou, and like his brother, he hates him and wants to kill him in revenge for what he's done.