Akemi: "A week? You can eat this many apples in a week?"
Maruchi: "It's my favorite food."
Akemi: "Yeah, well, I like ice cream, but you don't see me eating a ton of it!"
Maruchi: "Wouldn't that be because you need to watch your weight?"
*Gets hit in the face with a two-pound bag of apples*
Maruchi's "Onee-chan!!" scene. The whole thing is completely absurd, especially considering that he's never acted like that aside from this one time. Apparently, wanting revenge on Akemi warranted this response.
Maruchi: We're not usually this bad-tempered towards each other. Rokuro might just be in a foul mood because of his little nudity complex.
Rokuro: I DO NOT HAVE A NUDITY COMPLEX! *beat* AND I'M STILL WEARING PANTS, YOU KNOW!
Akemi hits Rokuro with an English textbook to get him to stop yelling, to which the wizard just sits there in pain. When she tries to threaten Maruchi with the same treatment, he threatens to kill her.
Then later, when Akemi asks the student-teacher pair about their "bet", Maruchi stays awkwardly silent as if he were actually scared of she would do to him if she found out.
"I'll just go prepare lunch. Maybe having food when they come back will be enough to appease his Royal Pole-Up-Ass's bad mood."