When she was walking alongside I thought she was huge but thats because she was on the fence, the "boys should protect girls" line was copy-pasted and the attacker is a mob character with vag for eyes.
Everything is as expected, will continue observation.
Edit:
Disappointing Translations is...
@miscacc like Purplelibraryguy said, it's most likely a real thing (unless the author just came up with a twisted version of their own failed reservation) but given how many restaurants are in cities these days, anything that drives away customers is to be thrown out asap.
I think step-sister is more likely given their ages. Either way, armpit harem is something I can get behind.
Edit: forget what I said about in-laws. You can't have a sister in-law without being married.