Sensei wakes up from an apparent nightmare, finding Ami watching over him with a concerned expression. After making sure he's okay, she asks him to get up so he can explain why some random girl is here to visit him. He disregards this as typical for his life and tries to go back to bed, telling Ami to make them leave. Ami however refuses to let him ignore the situation, especially since this mysterious girl hasn't said a word, only holding up a sign before beginning to rummage through their possessions. Upon hearing this, Sensei realizes who the mysterious visitor is and once again tries to sleep until Ami forces him out of bed.
Reluctantly, he gets out of bed and heads into the living room, confirming his suspicions that the girl was Nao-chan. Ami soon joins him, asking for an explanation that he's unable to give. Instead, he fills her in on the story behind his meeting with Nao, including the detail that she's being cared for by Kaori. Nao pulls out a notebook filled with premade answers from Kaori, flipping to a page that helps explain why she's here – Sensei's being asked to babysit her. After an attempt for further explanation fails, Ami suggests that Nao's here because Kaori didn't want her to be cooped up inside their apartment all day. She also apologizes for her recent freak-out regarding Kaori, much to Sensei's confusion. Nao flips to her next sign, which both confirms Ami's assumption and requests Nao be taken to the mall so she can pick out new clothes. Not wanting to do any of this, Sensei leaves to make a call to Kaori.
While he's on the phone, Ami decides to make sure Nao isn't here to create another obstacle between her and Sensei. Nao quickly promises to not cause trouble, though does ask that she be patted on the head in return. Ami agrees to this and very quickly warms up to her, getting lost in her head patting until Sensei returns and interrupts the moment. He confirms that, since Kaori needs to work late, and Yuki is also busy, responsibility for Nao has fallen onto him. As such, he immediately attempts to pawn her onto Ami instead. Ami objects, explaining that she has work today and isn't in the position to be requesting days off.
Seeing he has no choice, Sensei decides to babysit Nao for the day. Ami takes her leave, but not before reminding Nao of their deal.