Next, I'll think about the structure of the report. A typical report might include sections like Introduction, Linguistic Analysis, Cultural Context, Usage in Different Scenarios, Common Misunderstandings, and Conclusion. Let me outline each section with possible points.

Rina feels a pang of jealousy. She is used to being the "deka" (the big shot), but now her brother is the one who is "deka" (huge). She tries to sabotage him slightly by telling the girls he has weird habits, but Sora’s natural clumsiness and kind heart only make him more endearing to the girls (the "gap moe" effect).