When Tsunayoshi Sawada became Tsunahime Sawada, when Tsunahime was adopted by Sawada Iemitsu and also had the first-generation Vongola bloodline, when Tsunahime's biological brother was Nakahara Chuuya.
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1. Zhongyuan Zhongyuan is also the carrier of Arabatu, and after fusion with Aroba Tu, it has the superpower of Araba Tu. So I gave little angel Chuuya a little sister.
2. The heroine and Chuuya were in the orphanage before, and then when the heroine was 12 years old, the heroine was adopted when the heroine was 4 years old, and then lost contact with Zhongya, until the heroine was 7 years old, when Zhongya was 15 years old, Zhongya joined the port Mafia, and went to the orphanage to find out the address of the adoptive heroine's home. He got to know the heroine, and after he was sure that the heroine was doing well, he subconsciously distanced himself to protect the heroine.
Chuuya was in an orphanage when he was 12 years old. From 12 to 14 years old, he was taken in by the "Sheep" after being used as a test subject in the laboratory. He joined the Port Mafia until he was 15 years old.