Aqua Hoshino

"The guy who made Ai go through such a thing is in the entertainment world. Since that guy is related to me by blood, I can track him through genetic testing with a piece of hair. I can't die yet. Not until I find him. and kill him with my very own hands."

Aquamarine Hoshino (星野・アクアマリン) is the titular main protagonist of the series. He was known as Gorou in his past life, a medical doctor who treated patients. He developed an obsession for idols (specifically for Ai Hoshino, an idol of the defunct idol group, B-Komachi) after encountering Sarina, one of his patients who held that same infatuation. He was reincarnated along with his twin-sister Ruby Hoshino, formerly known as Sarina, and is now the child of Ai Hoshino.

In his new life, after the death of his mother, he swore he'd do anything to find whoever was behind it; unrelenting in his goal, unlike his sister. Many of his actions are driven by this very ambition. He is willing to do anything to get closer to the truth.

Appearance
Aqua is a blonde and is quite tall. He has blue Aquamarine eyes, which is what his mother named him after. He often changes his appearance due to his job as an actor. He is described as "handsome" and features a star in his right eye; symboling that he and is sister are one half of their mother.

Due to him being Ai Hoshino's son, people point out their similarities, much to Aqua's dismay; wanting to keep things secretive about their relationship.

Personality
Before the death of Ai Hoshino, Aqua was relatively normal, however, him having the experiences of his past life, he was able to do things unexpected of his age. Performing acting jobs was something he was open to and excelled at.

After his mother's death, however, he was a changed man. He became cold, calculated, cunning, and discreet. He transformed into a man willing to do anything to see his goals through.

Despite this, he does genuinely care about the people around him. He's unwilling to let his sister become an idol because he doesn't want her to end up like their mom. He helped the new B-Komachi group in preparing for a gig so they could accomplish a task long thought impossible. He was even one of the main driving forces behind a project that served to save Akane Kurokawa's reputation.

Story
Gorou was a 30 year old doctor and a huge fan of the idol Ai. He was his fan because of a 12 year old patient of his named Sarina used to adore her, before she eventually died. When Ai was pregnant, she came to Gorou's hospital to give birth to twins. Because he was in charge of her, he was murdered by an anonymous stalker and was reincarnated into Hoshino Aquamarine, the son of Ai.

At the age of 4, Aqua witnesses his mother getting stabbed by that same stalker after answering the door, who later committed suicide. However, Aquamarine thinks it's more than a simple "crazed stalker" situation and believes the stalker had been given information about her location by someone close to Ai, which he theorizes is their unknown father, and swears to avenge his mother's death by killing him.

Relationships
Ai Hoshino: Aqua's mother. In his previous life, Ai was his favorite idol and he was an obsessed fan. When Gorou died, he was reincarnated as her son. Despite their years living together as mother and son, he never got to truly realize Ai as a person, as she intentionally hid her true self. Regardless, her life and death alone made him into the person he is today.

Ruby Hoshino: She is Aqua's younger twin sister and one of his patients before they reincarnated. He wants to protect her and doesn't want her to become an idol, as he fears the possibility of her meeting their mother's fate yet again. Because of his overprotective nature, he gets labeled a "sis-con" by his sister and Co. Even if both don't show it, they truly care about each other.

Even if he doesn't want to do something, he is willing to go through pain to see out his goals. Whether it be through acting jobs or participating in a reality-dating show and putting up a face. He wants to do it for his and his sister's sake.

Unfortunately, after all is said, they are unaware of who was who in their past lives.

Taishi Gotanda: Aqua's boss. Aqua first met Taishi at the age of 4 when Ai brought him to the studio. Taishi talked to him and noticed his strangely mature way of speaking, so he offered Aqua to act in his movies but was shut down. Later, Aqua took his offer in exchange for him giving Ai a job. After Ai died, Aqua asked Taishi to raise him and work as his assistant. He currently works as Taishi's assistant behind the scenes.

Kana Arima: Aqua met Kana at one of Taishi's movie sets. She was outperformed by Aqua's acting skills and was inspired by it. She later met him at their high school and they became good friends. He later convinced her to join his sister to start an idol group.

Akane Kurokawa: Akane and Aqua met at the reality show, LoveNow. She became a target of social media for accidentally injuring Yuki, another actor in the reality show. Aqua stayed up nights making the video that would go on to redeem Akane's reputation. He also saved her when she attempted to suicide following that very incident. Currently, Akane is his girlfriend. However, it should be noted that he has stated that the relationship is strictly for work.

Trivia

 * Everyone calls him "Aqua" because "Aquamarine" is too long.
 * His mother has one star in each eye, he inherited a star in his right eye and his sister inherited in her left eye.
 * He says he can't really use technology like the youngsters do.
 * He is constantly called a siscon