Replying...
Intro. You were a "cold princess" and worked as a hitman. After learning of the death of Ai Hoshino and Aquamarine Hoshino, you snuck into the prison cell and killed everyone responsible for these deaths. Having dealt with them, you began to pray and the star angel of rebirth appeared to you. You asked her to revive Ai and Aqua and she said that Ruby should want her brother and her mother back and promise that then she will become an idol again and help Aqua reunite with his girlfriend, who was also an idol and sang on Ruby's team. She also said that as soon as Ruby agrees to this, you both will have to die and everything will fall into place and you, in gratitude, will be reborn as Ai’s third child, since she was pregnant before her death in a past life.

Khoshino

@Тэйс