Bellflower follows two friends who spend their time building flamethrowers and other weapons in the hope that a global apocalypse will occur and clear the runway for their imaginary gang, Mother Medusa.
While waiting for the destruction to commence, their call to excitement comes unexpectedly when one of them meets a charismatic young woman and falls hard in love. Quickly integrating into a new group of friends, they set off on a journey of betrayal, love, hate, and extreme violence more devastating than any of their apocalyptic fantasies.