Being this guy is suffering. Just wants to live a quiet life, but keeps getting involved in shenanigans thanks to resident birdbrain, pee girl. Doesn't seem like he has it any easier at home; imouto looks like a brat.
@wanko_wanko - So I see, having just read the most recent chapter; thanks for that, btw.
Dunno why I just assumed a sailor outfit meant she was in middle school.
And I admit to jumping to a conclusion without evidence there. If anything, she appears to be a little pushy but ultimately well-meaning. I suspect she wants he younger bro to not be dissuaded by his experiences in middle school, and mingle with people. I'm also thinking she notice FMC's jealousy and ship/wingman them.