1. Grandma asked Yaji why she was named Saka. Yaji later told the little girl you know, my sister, I also have another name called Saka, which is actually the name of Yaji's younger sister. This seems to indicate that Aki wants to get the position of his own sister.
2. Grandma went to Yaji's parents' house. The parents were nervous that the eldest daughter went to study abroad, which means that the parents did not know the whereabouts of the eldest daughter Yaji who ran away from home. The younger daughter ran out happily, which further proved that Yaji was at home. Feeling that his parents were partial, he left home and lived with his grandmother.
3. Grandma stared at Aji and said that your nose is very high. When visiting Aji's parents, she also said blood relationship to Aji's father, especially the nose looks like her ex-husband. Grandma said this to Yaji, which is also a clue to Yaji's identity.
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