Before “My Entire High School Sinking Into the Sea” even begins, a pre-credits title card warns of stroboscopic effects to come. This is very considerate of the film, but it is the last moment viewers will see anything resembling thoughtful behavior from most of writer-director Dash Shaw’s animated teenage characters.
The existence of high school sophomore Dash (voiced by Jason Schwartzman) is one in which it has been decided — entirely by Dash, of course — that since his acne has cleared up in time for the new school year, he will set about becoming popular and conquering his environment with powerful journalism for the school paper.