Hikaru Kamiki/Relationships

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

Ai Hoshino
Ai Hoshino had a secret relationship with Hikaru, to the point that they slept together before they ended their relationship. Akane observed when she watched some films of him that his and Ai's acting are quite similar; Ai probably learned her acting from him.

Later on, Hikaru was implied to be the person responsible for giving Ai's address to an obsessive fan named Ryosuke Kaihara so that he can murder her on the day of her dome concert.

Aqua Hoshino & Ruby Hoshino
Aqua and Ruby are Hikaru's twin children through Ai Hoshino. Their children don't know exactly who he is nor have they ever met in person. Still, he is aware of their existence. However, Aqua who deduced that it was him behind their mother's death, hates him with all his strength and wants to kill him at any cost to make him pay. Ruby on the other hand, only knows that there were two people responsible for the death of Ai and Gorou Amamiya but doesn't know that the other person is their father. But like her brother, she also hates him and wants to kill him in revenge for what he's done.

Akane Kurokawa
Hikaru gave Akane white flowers for her awards celebration. His physical resemblance to his son was more than enough to lead her to the conclusion that he is Aqua Hoshino and Ruby Hoshino's father, together with all the researches she's done on him.

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

Airi Himekawa
It is implied that Hikaru was molested and raped by Airi when he was eleven and she ended up getting 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.

Yura Katayose
Yura Katayose is Hikaru's drinking buddy before her demise, when Hikaru presumably pushed her over a cliff.