My mind went to the two when he mentioned people stronger than him, but I immediately forgot he was trying (or should be trying) to free them a second later because of the school arc.
The intruder looks like the first girl they start to talk too in the previous chapter, but Miyako stops the club member (I don't remember any of their names besides Nanako), and runs away.
I feel like I'm missing something, and it's probably because it's not translated yet, but who's the girl with the pigtail? The one that gets kiss/bitten? Is it our MC with a new hairstyle?
Dude's the one who tell her to go for it, even telling her why he won't be coming into the bath only to barge in at the worst time, ruining the scene. What was the point.