Waratte! Sotomura-san - Vol. 3 Ch. 46

[MangaDex]

 

[BakedBanana]

We need more chapters of the MC brother school lol.

 

[NicholasTurner]

All his classmates are very rude, they've never met his sister yet assume the worst and when he says they have the wrong idea about her they're just like "oh silly naïve little boy, we know your sister better than you ever could, you're clearly being fooled by her."