I don't know what people seem to hate so much about this series. Sure the MC is really childish for his age, but this was stablished since early in the series, and the MC is trying to improve bit by bit, i think last chapter could be handled better, with the MC instead of going bananas on the guy, just talk it out and act more maturely. But whatever, i'm not here to rage on the author just because the guy doesn't act maturely or don't ever fuck up, he is childish, has many mistakes, and even if he is oblivious to most of them, he still improved a bit since the start of the series.
This was a good chapter and i hope the kouhai can improve.