If you think this is a normal romance anime please be informed that this animecontain 18+ scenes. So you will find mature and smut and can be label as a hentai.Its NTR as well. lol
(NRT can be defined assomeone's girl/guy being stolen. It can be rape or not even have holding hands, as long as he/she falls in love with the other person.)
The anime itself is not for the weak heart but if urstrong enough then you can give a try for the anime (currently airing) or read the manga since its almost finish.
(Would prefer to read the manga because of this. ^^ tho this is just my personal opinion)
That's people for you. Trusting one another, helping one another----- it's all a fantasy. Humans are creatures that will always betray.