All right, I don't remember this being posted yet, so here's another pretty cool yandere find.
Doing what I do on Google (that is, typing "yandere" + some other unimportant words into the search to see what comes up), I found a series called
Soutaisei Moteron.
It's about a group of kids in school trying to figure out ways to become popular.Go ahead and click on that link and see what chapter seven is named.
Ch.7: Strategy to Catch a Yandere
The entire chapter is yandere themed. The manga itself looks to be a comedy series. I haven't read any of the other chapters yet, though I may do so later. Anyway, read the chapter. I feel we can all empathize with the MC in question.