Ryosuke Kaihara

""You liar... To think you have a brat... Why... You deceived me...""

Ryusuke (竜介) was an obsessive fan of Ai Hoshino whom he murdered after learning that she was pregnant with twins before killing himself to avoid being arrested for murder and being questioned about why he did it.

Plot
After learning from someone that Ai Hoshino was pregnant, Ryusuke was enraged and went to the hospital where she was staying. Garnering suspicion from her doctor, Gorou Amemiya, a chase started between the two, ending with Ryusuke taking Gorou's life.

After a few years, Ryusuke would learn from the same person where Ai's new apartment was. Concealing a knife within a bouquet of white roses, Ryusuke went to the apartment and fatally stabbed Ai in her home. As Ryusuke began to lash out at a bleeding Ai, she weakly told him that she wanted to love her fans, even remembering his name and the star sand he gifted her. Hearing those words caused Ryusuke to run away in horror and anguish, leaving Ai to die from her injuries.

Ai's death was announced to the public, and it was later revealed that Ryusuke had committed suicide shortly after. Because Ryusuke was already dead, the investigation revolving around Ai's murder ended instantly.

Etymology

 * The name Ryusuke means "dragon" (竜) (ryu) and "help, assist" (介) (suke).

Trivia

 * It is theorized that the reason why Ryusuke committed suicide was to cover up for the same person who leaked Ai Hoshino's address information to him.