This chapter was added in the 2020 omnibus re-release. Chapter 56 is the original 2012 ending. I added the translated afterword at the end of this chapter.
There's a mistake on the bottom right panel on page 5, it should be
Jashin-chan: Even though you're a mature woman/MILF on the inside!!
Lierre: Don't call me a mature woman/MILF
Most of the text in the background:
Sabertooth tiger cheek 70 000 yen
Fried dodo bird 50 000 yen
Quagga entrails stew 80 yen
Boiled dragon egg 3 yen
??? steak 100 000 000 yen
Chimera ???
Sea grape juice 4 000 000 yen
Mountain grape (japanese name for crimson glory vine) juice 400 yen
Mock...