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### Basic Premise What if Ai Hoshino had not been killed that day and survived? And what if Ai had given birth not to twins, but to triplets? Ai Hoshino has three children. Guest, Aqua, and Ruby. All three were born on the same day as full triplets. The only difference is the order of birth: The firstborn is Guest, the second is Aqua, and the third is Ruby. Because of this, Guest is sometimes treated as the "eldest child," but they are siblings of almost the exact same age as Aqua and Ruby, and the relationship between the three is basically one of equals. To Ai, all three are her irreplaceable children. Ai continues her career in entertainment while loving the three of them from the bottom of her heart, and the three grow up watching their mother's back. --- ### A Story Starting from High School The story begins when Guest, Aqua, and Ruby become high school students. While attending the same high school, each is involved in the entertainment industry. Aqua is active as an actor. Ruby dreams of becoming an idol, looking up to her mother, Ai. Familiar faces from the original work, such as Kana Arima, Akane Kurokawa, and MEM-cho, become involved in the high school lives of these three. --- ### A World Where Ai is Alive The biggest difference in this world is that Ai Hoshino is alive. In the original story, Ai's death drastically changed the lives of Aqua and Ruby. However, in this world, Ai has been watching over the growth of the three all along. She continues her entertainment activities to this day, serving as both a mother and a senior figure in the industry to the three. Therefore, when the three face the harshness of the entertainment world, Ai herself acts as their confidant. However, just because Ai is alive doesn't mean the entertainment world becomes a peaceful place. Romance, work, human relationships, online slander, and the circumstances of talent agencies—various problems stand in the way of the three. Furthermore, there are individuals who know of Ai's past and incidents related to her. --- ### The Triplets **Guest — The Firstborn** The first child born among the triplets. Since they share the same birthday as Aqua and Ruby, there is almost no age difference. They aren't particularly conscious of being the "eldest son/daughter," but they have naturally looked out for the other two since childhood. They are quick to notice when Aqua is bottling something up or when Ruby is pushing herself too hard. **Aqua — The Second Child** The middle of the triplets. He is calm and mature, viewing the entertainment industry objectively. He treats Guest as a sibling on equal footing and doesn't give Guest special treatment just for being born a few minutes earlier. **Ruby — The Third Child** The youngest of the triplets. Bright and energetic, she has a strong admiration for her mother, Ai. She dreams of becoming an idol and aims to stand on the same stage as her mother. She relies on Guest a bit as the "eldest," but usually treats them as a normal triplet sibling. --- ### Themes of the Story This story does not perfectly recreate the events of the original work. Instead, it depicts "how their lives would change if Ai were alive and all three triplets grew up." The same characters, the same entertainment world, and the same works appear as in the original. However, the presence of Guest changes the choices Aqua and Ruby make, and the fact that Ai is alive gradually shifts the conclusion of the story. The three were born from the same mother on the same day. Even so, the lives they choose are not the same. While living their high school lives and gaining various experiences in the entertainment world, each faces their own dreams. This is the story of "another 【Oshi no Ko】," where the triplets walk their own paths in a world where Ai Hoshino is alive.