Ruby Hoshino

"Life is about doing what you want to do! If you keep talking cost this return this, you won't accomplish anything! Life can end before you get a chance to accomplish anything, it happens."

Ruby Hoshino (星野瑠美衣) is the deuteragonist of the series. She was known as Sarina in her past life; a patient with a terminal illness who became obsessed with idols. She, along with her twin-brother Aquamarine Hoshino, formerly known as Gorou in his past life, is the child of the former (now defunct) B-Komachi member, Ai Hoshino. Inspired by her mothers' line of work, she wishes to become an idol just like her, only if her brother wasn't so overprotective of her ever since their mother died.

She's currently working with Strawberry Productions to revive B-Komachi so she could fulfill her dreams along with the support of her friends.

Appearance
Ruby Hoshino possesses features that liken her to her mother; more often than not being compared to her in many aspects. Such as her facial features and the distinct look in her eye featuring a star.

She sports blonde hair with pinkish highlights at the end. Her eyes are ruby-colored, which her mother named her after, and usually wears an idol outfit.

Personality
Unlike her brother, who is calm, calculated, and discreet, she is the polar opposite of him. She is extroverted, outgoing, loud, and the like; being the most apparent with the connections she made with others, whilst Aqua only does this to further his agenda. She doesn't share her brother's opinion of hunting down the culprit who killed their mother, rather moving on from that incident and focusing on her dreams. She persists in this notion to the point where she often conflicts with her brother's interests.

Story
As Sarina, Ruby was a big fan of her now mother, Ai Hoshino. She wanted to get reincarnated as her daughter and to have a face like her. With due time, her wish gets fulfilled as she is born as Ai's younger twin. However, only a few years after that, a crazed fan takes her mother's life and Ruby loses the idol she treasured both in her previous and current lives. After Ai's death, Ruby starts working hard towards her goal, striving to become an idol like her mom was. Thus, she forms her own group and gets signed by her adoptive mother's company and Ai's former idol agency, Strawberry Productions.

She names her group after her departed mother's idol group, B-Komachi, and makes a Youtube channel where she and her group uploads videos with the help of Memcho, one of the idols in their group and a renowned Youtuber. They hit the milestone of 10,000 subscribers there. Later, they receive an offer from one of her brother, Aquamarine's acquaintances to participate in one of the biggest idol concerts across the country, the Japan Idol Festival. Even though Kana, another member of her idol group, disagrees with the idea of newcomers debuting in such a prestigious event, Ruby and Memcho convinces her to accept the invitation. Hence, the revived B-Komachi go on to deliver their first performance on the grand stage, earning rave reviews from fans.

Relationships
Aquamarine Hoshino: Ruby Hoshino's older brother. He is very overprotective of her sister; not wanting her to walk the same path that killed her mother. He is often called a "sis-con" by her and her friends due to this and the lengths he goes to prevent her from achieving her dreams. Often she is hindered by his presence and is annoyed by his personality, as seen when he puts on a face when he first entered a dating show: these scenarios being incredibly off-putting for her and her colleagues.

As time goes by, he becomes more and more accepting of her sister's wishes and even goes as far as to help them prepare for their gigs. He disguised as Pieyon to prevent any problems in coordinating their dances and singing. He and Ruby are closer than one might think, but not to the point where they aware of who was who in their past lives.

Ai Hoshino: Ruby Hoshino's mother. Even in her past life as Sarina, was a big fan of her and her work. She was elated when she reincarnated as her daughter, as she was able to get to experience her dream before her goal in becoming an idol. She was spoiled and demanded her mother's attention whenever she was around. She loved her life despite of her mother's mental state. After her mother's passing, she was determined to follow in her footsteps.

Mem-Cho: She is a member of Ruby's newly revived idol group B-Komachi. Initially being picked up by Aqua after their performance in "LoveNow": she uses her talents, experience, and notoriety for the group's fame. Despite being the oldest in the group, way past the ripe age for an idol, Ruby was accepting of her, as they shared the same dreams, and still looking completely eligible for an idol.

Kana Arima: Ruby and Kana share a history. They've known each other since they were children and even go to the same high school. They often talk to each other about their line of work and due to Kana's affinity towards Aqua, they banter on about him. They both share their disliking towards his personality and his unwillingness to do much.

Kana dislikes Ruby's intense personality but she admires her dreams. This served as a leeway into her becoming an idol due to peer pressure. Now she works with Mem-Cho and Ruby as members of the newly revived B-Komachi group. She acts as its lead performer and center, despite an unwillingness to become it.

Trivia

 * Her mother has one star in each eye, she inherited a star in her left eye and her brother inherited in his right eye.
 * She wants to be an idol like her mother once was.