Known issueHow-toUpdated · 2 replies on Steam
FUTA FUCKS FEMBOYS: How to Get Ending 2?
Short answer
Suggested fix (unconfirmed): Maintain Felix in his normal human form by selecting the top dialogue options, and then refuse to continue the battle with Onyx after the x-scene on day 14.
The problem
Its my last achivement
What players suggest
To get this ending, you need to: 1) Be on the 14th day. 2) Choose, for example, the top answer options with Felix (the main thing is to make sure that he does not change his appearance). 3) Abandon Onyx after the x-scene.
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.