The nurse is a bit weird and off-putting at the beginning; I didn't know if I should mentally prepare myself for psychological fucked up shit based on the first chapter... but it was surprisingly tame. The nurse just doesn't believe in love and likes to have fun lol. The teacher is a sympathetic figure who has a pure/innocent view of romantic and physical relationships. He's an interesting character. His mother abused him when he was a kid but she showed him motherly affection too, which left him with complicated feelings towards her and (perhaps) women. So, now as an adult, he has difficulty developing romantic or sexual (or reciprocal, i guess?) relationships with his partners. The nurse plays a part in prying into this issue... bc it's fun lol. Anyway, this is the teacher and nurse's unusual love story. It's pretty good.
Oni to Tengoku