None of My Younger Brothers Are Normal

As the title says, I think all my younger brothers are abnormal. For now, call me Yena. My surname is so common that, to avoid creating some kind of strange magnetic field, I'll leave out any particular one. My first younger brother was the heir to a small Mafia family. Though he had a nasty personality, he was unquestionably a genius among geniuses. I was looking forward to him becoming the family head and building up the family, so I could bask in his success, marry a rich, handsome man, and reach the pinnacle of life. Who knew my damn idiot younger brother from a parallel world would try to mess with my brother in this world, and then I died. Even more unexpectedly, the foundation of the world sent me to the world of a good friend, but a mishap during the process left me with amnesia. In that world, I got a new younger brother, but! This new brother was a total black hole of negativity, thinking about killing himself every day. In his rebellious phase, he even joined the local Mafia! I'm tired. I'm really tired. Heaven, can't you give me a normal younger brother? The book heard my plea and sent me to the world of its good friend after I died. And then... Heh. Looking at the curse behind my white-haired, blue-eyed younger brother, with blood flowing everywhere, I understood. Sure enough, this world should be destroyed. At the very end, the foundation came crying to me. My first younger brother had turned evil and was threatening to destroy the world. Yena: (▼皿▼#) First world: The eldest daughter of the Gesso family in Sicily, Italy. Second world: The elder sister of an executive at the Port Transportation Company. Third world: The twin sister of a certain strongest person. I will dodge the death flags. Mostly slice of life. The characters belong to their original authors, while OOC belongs to me. Theme: Find hope in the darkest moments