as far as i know, there is none for the moment.
but the game still in its very early version so dont think we really need one for the moment.
1. if you want to go the NTR route keep choosing to NOT SPEND TIME with the gf everytime.
2. if you want to go for happy or true love, always spend time with the gf everytime the choice arise.
3. for Netorase route, it only being teased in 1 choice so there are no content for this route yet.
just to clarify, the Dev stated that even if you aim for the happy or true love route, your gf will still being blackmailed and harrased by the antagonist to certain degree. NTR is not avoidable, it is the name of the game afterall but you can "control"the NTR to some degree, for example (spoiler ofc)