I almost forgot to mention, you might want to check out RinPana Go Explode, a sequel/prequel/something of this. Not really required reading, but definitely more along the same line.
I died at the love hotel part. I never thought about it before, but I really can see Hanayo as the one who is more knowledgeable about those things than Rin would be haha.
I do not know what is better; the "Catharsis Gauge" explanation for the ridiculousness of tsundere interaction, or the rambling, improvised relationship advice that falls apart as quickly as an exploded bridge.