The Oda Family's Eldest Daughter Wants the Surname Dazai

Announcement: The revised IF version is being posted next door (updates ongoing). As Oda's eldest daughter and the lucky survivor of the Mimic attack, an unexpected survivor whose story went untold, Oda Baicheng used her ability and successfully turned back time. Just as she was trying to save Oda Sakunosuke, she was astonished to discover that: Mori Ogai, the Port Mafia boss, had died unexpectedly in the battle against Mimic. Dazai Osamu had seized the opportunity to take his place. Most importantly... her dear old dad and that lump of black sludge didn't even know each other?! After hearing this from the Port Mafia's new boss, the eldest daughter looked at Dazai Osamu, who was supposedly a stranger to her, and watched him identify her in a single sentence. She was a little bewildered. Then Oda Baicheng joined the Port Mafia. The boss personally trained her, made her captain of his own special forces, paired her with Nakahara Chuuya, and eventually promoted her to executive. In the blink of an eye, four years passed. Just as Baicheng had gotten used to her life, passed Dazai Osamu's various bizarre "graduation tests," and started looking forward to her "graduation present"... The boss killed himself. Nakajima Atsushi defected with Izumi Kyoka. Nakahara Chuuya announced the boss's last will: "I appoint Oda Baicheng as the new boss." Oda Baicheng looked at the Port Mafia members kneeling before her, then at her "graduation present" (the red scarf passed down from boss to boss), and thought of the body that had fallen from a high-rise. She fell silent. Then she turned back time once again. Only to discover that she had returned to the point four years after her dear old dad's death. OOC is mine; the characters belong to teacher Asagiri. Pairing: Boss Dazai. Updates whenever inspiration strikes. Theme: I want to see if you can still die this quickly without an heir.