That's what this warning suggests. The dev really should clarify this once and for all, here on itch and on f95 as well.
Viewing post in Mika's Adventure NTR HAREM[V.0.1.7] comments
No, there is no NETORARE from MIKA's perspective. Rather, the game NETORI committed by MIKA, depicted from the viewpoints of characters such as LEO (who are the ones being NTR'd). This tag is added solely to indicate that the game may include perspectives of other characters who are subjected to NTR.