I enjoyed Demon Girl but I have mixed feelings towards it.
Nie Qing Cheng and Ming Xia are super cute characters that I was cheering for the whole time.
Zhang Zhe Han and Li Yi Tong had great chemistry and you will fall in love with them. You'll also love He Rui Xian as Jiang Xue Wu. She does an amazing job bringing her character to life.
My main complaint with Demon Girl, is that it's repetitive. The same situations will happen a couple of times. One at the beginning, one in the middle, and one at the end. Since it's repetitive, it's predictable.
Also note this is another open ended show. They purposely did it to create Demon Girl 2 and even though I enjoyed this show, I don't feel the need to watch the sequel.
Overall, it was a good show to watch but I wouldn't watch it again and it didn't move me enough to watch the sequel.