I was wondering what was Toji watching so I did a quick search for that "ピアノ売ってちょーだい". It turned out to be a tv commercial for a company that sells used pianos. I included screenshots of an article I found about the CM. Can't guarantee all info is correct tho.

Sometimes it takes her a bit to get jokes. #fushigurotoji #mamagumi #megumama

#fushigurotoji#mamagumi#megumama

Satoru-nii finally meeting his stepsister's besties (to judge them) https://t.co/R6s2qLYGmW

Extra~ pov: they were on a date and it started raining like crazy and he ends up taking her to his place etc etc

Every few days I be going through my day peacefully, then I suddenly remember this panel. "Even now, he's living" oh boy OH BOY