But sexual content is mild and mainly confined to kisses and hand-holding. There's lots of emphasis on liking others: who has a crush on whom, who's texting whom, etc. Since a romantic relationship is central to the plot, expect flirting, dating, and kissing. Parents need to know that Heartstopper is a romance between teen boys that's set in England and based on the webcomic and graphic novel series by Alice Oseman.