Need help to identify Japanese TV programme

I was watching Japanese TV a couple of weeks ago on the computer using TVU and I saw part of a program which I would like to identify.

It was around the beginning of June. I think it would probably have been late in the evening German time, around 10 or 11pm. It is possible that it was earlier (perhaps in the afternoon), but then it must have been Saturday or Sunday. And I was using TVU, so it could only have been one of the 4 channels there (Fuji, NTV, Asahi and one other that seems not to be listed at the moment.)

It was a sitcom or drama set in a library, with 4 people working there, 2 men and 2 women. There didn't seem to be any actual customers. It was all done at a very relaxed pace (as befits a library I suppose). In the part I saw there was a long discussion about an insect on the wall, which one woman wanted to kill and the others didn't.

Not much to go on I know, but if anyone has any idea of what it might have been, I'd be interested to hear.