The World of Kanako (2014)

Same idea of perfect students committing crimes, but World of kanako focuses on the search of them. Even though extracurricular is dark, world of Kanako is darker.

Both deal with hidden, twisted societies, where seemingly innocent kids behave maliciously. While Confessions is a film in which several characters develop the plot by making confessions from their points of view, in the World of Kanako, former detective Fujishima has to uncover the appalling world of his daughter Kanako layer by layer. Two very dark films executed brilliantly.

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

Both films show a highschool girl who is pretty and popular and totally psycho! She is involved with gangs and treats people like playthings. School bullying is also involved.