I Fell In Love With The Demon Lord

I thought I had a nice and comfortable life. Friends, family, even a girlfriend, but it seems life had other plans. All it took was one day for it all to come crashing down and my whole world turned upside down, in fact, I wasn't even in my world anymore, our whole class had been brought to another world and my days of hell and misery began.......until an angel, no, a demon appeared in front of me...... (P.S- I can't add it to my tags but this is a yandere romance along with the rest, there will also be MANY r18 and borderline r18 scenes including a msub and fdom dynamic)