It was Mami who booked Chizuru! She had found out that Chizuru was a rental girlfriend.
Entering the karaoke bar, Mami asks Chizuru about her relationship with Kazuya.
Meanwhile, Kazuya, who is working part-time, happens to see the two walking through the bar and observes what's going on.
In the midst of all this, Mami throws another question at Chizuru—"I was wondering if you ever fall in love with someone while you're working as a rental girlfriend."