Sensei, wandering the halls for lunchtime due to not being hungry - which itself he attributes to Ami cooking up a storm thanks to finally hearing Ayane's proposal - decides to head back to the classroom and wait for everyone to finish eating instead. Expecting to be alone, he's surprised to fins Sana studying in her seat, staying back due to also not being hungry.
Semsei is also surprised to find out from Sana that another round of standardized tests is coming up, and she says she is studying history, which he laments his lack of usefulness in assisting with, but offers to help her out if she needs to study biology so long as they stay away from certain subjects.
Sana then asks Sensei if it's really alright with him for her to be in his apartment, which he affirms by telling her being a judge for the competition would help make things more fair, and that in the event of a tie, he already has a third judge lined up. Then, after being reminded on one of their first lessons, Sana asks Sensei if she'll be good at bartending, and Sensei is shocked when his answer to her question receives a sarcastic remark in response.
The topic diverts to Sensei's traching the class, and Sana becomes significantly upset to find out that Sensei will more than likely not be their teacher once the new school year rolls around, but he confides in her that he'd rather teach the girls all the way through college if he could, as he doesn't want to put in the effort to meet new people. After another mention of "the 'S' word" and a little more conversation, the two prepare to finish out the school day along with the rest of the class.