'Heathers: The Musical' is based on the '88 film about Veronica, a mere high school misfit who somehow breaks the chains and enters the most almighty and ruthless clique of girls at Westerberg High School: the Heathers.
Before too long, the new kid J.D steals Veronica's heart, and she's kicked out of the group. Veronica and J.D seek out to get some low-key revenge when they accidentally poison the clique's leader, and as they cover it up to make it look like a suicide, Veronica realises that poisoning isn't the darkest thing J.D has planned.