As for why it might be the last time...
Well, that's because it's almost time for the arts and sciences stream selection. After the upcoming three-way meeting, Shirakawa Sawahei will face his last class division in his high school career.
At Akihisa High School, the separation into arts and sciences is somewhat different from typical schools. Some schools choose to conduct the three-way meeting in the last semester of the first year, and then start the art and science division in the second year. This approach is neither good nor bad; after all, it's a private school, and as long as the graduation rate is high, it doesn't matter how they stir things up.
For Shirakawa Sawahei's three-way meeting, he doesn't plan to have Higashino Rin specially come over—anyway, Uehara Shigeo knows his situation and there's no way he'd bother him over such a small issue. At most, just telling him is enough to solve the parent issue for the meeting.
