I just finished the game and for somebody who have said to me that the amount of the NTR content was roughly 20% of total scenes, you are big fat liar. It's whole lot more than that. It's like 50-60% of the total scenes and most of it are not just your braindead 30 IQ NTR but brutal ones like in alicesoft. And although the true end is good, it's clearly NTR focused game. Damn I've been wasting my time playing this shit blindly, not worth that much if you like vanilla.
Like the other guy said, NTR part is entirely used to punish you for being ass at the game, and the majority is vanilla content. Literally just grab a full gallery save and see it for yourself; It's a game about you adventuring and flirting with a gyaru, if you get NTR'd then it's your skill issue.
Edit: This is what is written in the game's page btw:
* The ratio of events featuring the protagonist to those without him is about 8:2.
Most of these other events are not forced upon the player, but instead depend on choices made during the game.
Those that are mandatory are shown for tutorial purposes, and Monica can be rescued before the worst happens.
The NTR part is so trivial it isn't even listed as NTR on the page.
