Retail stores need to pay to throw away rubbish and they do so buy buying a ticket from the convenience store that they stick on the rubbish bag.
Some folks however just throw their rubbish out which annoys the rubbish collectors.
Here the rubbish collectors have left a polite message:-
Dont dump rubbish here that does not have a ticket or you will be killed"Korosu" means to kill. The term used here however is "Buchi Korosu" which means to "pound to death" ^^;