It is revealed that Rika has asked Misato for a job she hasn't seen in a while. It was no coincidence that Misato encountered Sousuke on the Shinkansen. The only possible explanation is that Shiho (or Sousuke's mother) told Rika that Sousuke was heading to Rika's parents' house. How much does...
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And that brings us to Rika-chan. She's the one who found out about all of it."
"She found the burner account where I'd recorded my 'crimes,' the photos I sent to those boys... even the fact that I was selling my body."
"She has all the evidence. That's why I can't defy her. If she speaks...