NIT Arunachal Pradesh is as safe as any other college in India. The institutes provide proper safety and regulations for girls and you won’t be dealing with any kind of a nuisance at least inside the campus.
It’s all about the settlement. Once done, you will enjoy the natural serenity and the time you spent there.
In the end, it depends on the circumstances and mentality that individuals possess, if we knew what’s going to happen then we could have avoided every bad thing that happened. Not everything is in our hands but safety is. Always make sure you are alert and keep the presence of mind and act accordingly.