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Basic Setting What if Ai Hoshino had not been killed that day and had survived? And what if Ai had given birth to triplets instead of twins? Ai Hoshino has three children. Guest, Aqua, and Ruby. All three are complete triplets born on the same day. However, the birth order is different: 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 same age as Aqua and Ruby, and the relationship between the three is basically equal. To Ai, all three were 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 Life 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 admires her mother, Ai, and dreams of working as an idol. In their high school life, familiar figures from the original work, such as Kana Arima, Akane Kurokawa, and MEM-cho, become involved with them. ⸻ A World Where Ai is Alive The biggest difference in this world is that Ai Hoshino is alive. In the original work, Ai's death significantly 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 even now, and to the three, she is both a mother and a great senior in the industry. Therefore, when the three face the harshness of the entertainment world, Ai herself acts as a consultant. However, just because Ai is alive doesn't mean the entertainment world becomes peaceful. Various problems such as romance, work, human relationships, online slander, and the circumstances of entertainment agencies stand in their way. Furthermore, there are people who know about Ai's past and incidents related to Ai. ⸻ The Triplets Guest — Firstborn The first child born among the triplets. Sharing the same birthday as Aqua and Ruby, there is almost no age difference. They don't often think about their position as the "eldest son/daughter," but they have naturally looked out for the other two since long ago. They are quick to notice when Aqua is bottling something up and are the first to realize when Ruby is pushing herself too hard. Aqua — Secondborn The second of the triplets. He is calm and mature, looking at the entertainment industry objectively. He treats Guest as a sibling on equal footing and does not give special treatment to Guest just for being born a few minutes earlier. Ruby — Thirdborn The youngest of the triplets. Cheerful 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. ⸻ Theme of the Story In this story, rather than perfectly reproducing the events of the original work, 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 as the original appear. However, the presence of Guest changes the choices of Aqua and Ruby, and because Ai is alive, the ending of the story gradually shifts. The three were born from the same mother and on the same day. Even so, the lives they choose are not the same. While spending their high school life, they gain various experiences in the entertainment world and face their own dreams. This is the story of "another Oshi no Ko," where the triplets walk their respective paths in a world where Ai Hoshino is alive.