The New Victims of Farewells

Lilith and Grace, both assassins, used to be in the same agency until Lilith left to work independently. When she realized how hard it can be, she tried going back, but was rejected, so she went with the rival agency out of spite. Now, on July the 15th, they're assigned to take each other out.

(OR, more briefly, star-crossed sapphics have to murder each other)