Just come back later. I decided to finish arc 1 for the next update. The arc 6 (second story) probably will be rebuild in rpgm mz because it's kind of a mess to create a battle system in ren'py even using other people's code.
This is a kinetic novel so the answer is nope. No choice/decision that will affect the story. But even then, is it really NTR or not, it's your own definition. There is someone commented that no NTR, but someone else said it is NTR. Just to make it clear, arc 1-5 will be the background for arc 6(2nd story).
