I'm not reading this in German, but the Mangadex English translation. Always enjoyable, but in Chapter 14, it was a bit far fetched that the policeman threatened to turn the girls into specks of dust, making them cry! Later, they hit him in the groin so, just desserts, I guess.
In Chapter 15, they tried putting him in a garbage sack and afterwards came up with an unusual solution for fulfulling Sat-chan's garbage-picking punishment.
Chapter 18 also stood out, with a Night at the Museum influence.
Chapter 19 had them successfully solving an actual mystery, about a missing "beckoning cat" figure.
I love these girls! And can you believe that one of the shop owners ("Old Man") actually encouraged them to go bother the policeman again? LOL.