From the afterword and the blog, this is the last stand-alone volume of Koishi Gourmet. A compilation volume is planned for C80 and contains a couple of extra chapters.

...we just HAD C80. Do you mean C81?

Kou said:
The snake is drawn using a model from a certain comic book. It's a secret.

Lucifer and the Biscuit Hammer?

Byakugan01 said:
...we just HAD C80. Do you mean C81?

I do not follow the event at all and I didn't know it has already passed, but it is indeed released for C80.

OMG OMG OMG!! The compiled volume's been released already! I must find it!

Hmm... Koishi in heels?

WANT!

randomness said:
Lucifer and the Biscuit Hammer?

This is exactly what I thought when I looked at it. It's likely true.