The core of this episode is Mahiro's decision—pushed gently by Mihari—to return to school. Since Mahiro is physically a middle schooler now, she can't exactly go back to her old life as an adult NEET.
We see Mahiro trying to navigate the specific social cues of middle school girls, often failing or succeeding in ways she didn't expect. Manga Comparison Oniichan wa Oshimai! - Episode 6
This episode marks a significant shift in Mahiro's social life as he (she) officially re-enters the world of education. 1. The Big Step: Back to School The core of this episode is Mahiro's decision—pushed
Kaede’s younger sister. She is tomboyish, protective, and initially suspicious of Mahiro. Manga Comparison This episode marks a significant shift
You see Mahiro dealing with the "first day jitters," which are amplified by her secret identity.
Searching for a guide to of Oniichan wa Oshimai! (ONIMAI: I'm Now Your Sister!) usually means you're looking for a breakdown of the plot, the specific "sisterly" milestones Mahiro hits, or perhaps where the episode lands in the manga.