Hey, hey!
Translator here - yes, this game is SFW, but have brutal description (No full depicted gore, but there is potential gore. Abuses are alluded to and voiced in words, but no actual depiction, as is manipulation).
It DOES have a English translation (Of all the 4 chapters that are released) - as well as Chinese Mode (Which is the original, and you can switch between with will.)
The gameplay is extremely long - I am estimating, if you are only playing one route, 10 hours or so (Average read speed), and longer if you are slow. If you explore multiple routes (Which by the way, is more of hanging out with characters - the FVN is linear), it will take up to 30-40 hours across 4 chapters.
Hope it helps to answer your question! Please enjoy.