No, i don't think NTR is avoidable...
From VNDB:
~~~~~
The protagonist can only watch the heroines as they are defiled by lust. Are there zero happy endings?! This is
the beginning of a full netorare adventure game!
~~~~~
So yeah, the "
happy ending" in the dev notes here might depend on the viewpoint from player to NTR content.
It's safe to say there is
no real happy ending in any route for those who want to save the girls from other dicks etc.
If someone played the game and found out i'm wrong with that conclusion then he can gladly correct me, but reading the comments so far confirms what i wrote.