After running into her at the cafe, Sensei tags along for another one of Otoha's vocal sessions, hoping to pry whatever secret she's hiding out of her. Upon arriving, though, they find out Niki's yet to arrive, which Sensei uses to his advantage to try to force Otoha's secret out.
After repeated failures, the two sit in awkward silence on the nearby couch. He continues to press for an answer, eventually getting Otoha to admit that whatever she's hiding is a problem she needs help resolving. From there the conversation continues, with Otoha confessing that it started from feeling too suffocated by people viewing Rin and her as a package deal, and not individuals
Before she gets too far, the power in the building suddenly shuts off with a loud bang, freaking Otoha out. She begs Sensei to try and find some electrical breaker, despite his insistence he has no knowledge of electrical technicality. He also insists that, given the scenario, something incredibly "cliche" is bound to happen - When she forces him to try regardless, and when he turns out to be right, the power returns and Niki finally arrives.
After being properly informed of the situation, she scolds Otoha and cancels practice to take the time to remind Sensei of her place in his life. With suddenly no plans, Otoha heads home, calling Rin on the walk back.