That head grip in the first page is straight yandere
Actually, it reminds me of Mysterious Girlfriend X... There's a chapter where Urabe comes to school with her hair even more disheveled than normal and Oka fixes it for her, putting it up so you can see her eyes and all of the guys start to notice how cute she is. Tsubaki gets jealous and mentions that he prefers her normal hairstyle on the way home. She takes out the hair pins or whatever are holding up her hair and asks Tsubaki to mess up her hair and the scene looks very much like that. (She also finds it strangely erotic to have her hair mussed by the person she likes and later tells Oka about it, who repeats the process with her boyfriend, causing her glasses to steam over and thinks something to the effect of, "Those two are into some kinky stuff!")