Thank you very much for the translation once more. Just one more chapter and I'll have a more clear picture of what's been going on in the VN.
That said, it's interesting to see that in this doujin adaptation, they mixed the bad-end part and turned it into the victory for the final boss. In the VN, Liese loses if she gets all the way down to Mitsuru. I suppose that was the only way they could get the scene with both of them getting tentacle fucked together, and it was considered to good to pass up.
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That's what this manga adaptation (it's published by a company [IIRC it's Kill Time Communication] so it's not a doujin) has been doing for the most part. The mind control and pig demons were definitely bad ends in the game, It does skip some scenes, like the shower slime one.