On the way to Tokyo, Haruka quickly became familiar with Sayu and Fang Zheng. She also told them about herself—apparently, Haruka had been sent to an orphanage by her mother, Yumi. In her memories, her mother had never once come to see her. Only her mother's younger sister, an aunt named Mizuki, often visited her and brought letters written by her mother.
Haruka had written several letters to her mother as well, wanting to meet her, but her mother always told her she could not take her with her... The reason Haruka wanted to go to Kamurocho to find her mother this time was because she had not received a letter from her in quite a while. Moreover, the contents of the previous letter had made Haruka uneasy. She was afraid she would never see her mother again, which was why she had secretly left the orphanage and tried to make her way to Kamurocho to find her.
As for Fang Zheng...
"This seems to have gotten a little troublesome."
While Haruka was asleep, Fang Zheng lowered his voice and spoke to Sayu.
"Huh? Troublesome?"
"That's right. Kamurocho isn't exactly a good place. You understand what a red-light district is, right?"
"Ah..."
Hearing Fang Zheng's words, Sayu suddenly understood, and her face flushed red.
"C-could Haruka's mother be..."
"Mm. I suspect Haruka's mother may not have been doing respectable work, which is why she put Haruka in an orphanage. And generally speaking, women in places like that tend to get caught up in trouble easily. In the worst-case scenario, she might have been dumped into Tokyo Bay in cement."
"Then... what should we do?"
"Convincing her to go back is impossible... Anyway, I'm telling you this so you'll stay alert. Keep an eye on this child and don't let her