https://www.nijiyome.jp/app/top/zetsumetsu

有几张图的颜色会比较奇怪，因为它下载下来是一系列的PNG格式的图片，然后这几张图没有调色板的数据（https://en.wikipedia.org/wiki/Portable_Network_Graphics#Critical_chunks），导致转成GIF的时候缺了相应的调色板数据然后就变成这样子了。但我想这应该不太影响大家冲所以懒得修正了（

translated by google:

The color of a few pictures will be strange, because it downloads as a series of PNG format pictures, and then these pictures have no palette data (https://en.wikipedia.org/wiki/Portable_Network_Graphics#Critical_chunks ), resulting in the lack of the corresponding palette data when converting to GIF and then it becomes like this. But I think it doesn't have a serious affect, so I don't correct it.

Did they just steal the CGs from other games and made it animated?

I swear I saw the exact same scene of 693-696 from Peperoncino

Base +17

I don't play this game so I can't answer you certainly. But I guess it MAY be a collaboration between these games, because the number of files in 1-50 are N rank cards, 51-150 are R rank cards, 151-250 are SR rank cards, 251-610 and 1001- are SSR rank cards, no cards in 611-1000. I think 611-1000 will be used in future, and 1001- may be the collaboration cards.

Base +7

1001+ are all collab scenes. Nijiyome is run by dlsite so they'll sometimes have collabs with smaller doujin groups in their games.

Peperoncino's tweet for Goblin's Burrow collab: https://twitter.com/PeperoncinoSoft/status/1325694614058262529

Base +11