"Heartstopper, Volume 4" ($11) continues the growth of Charlie and Nick's relationship. Summer is passing fast and a new school year is about to begin. Both boys have been thinking it might be time to start saying "I love you." Charlie's anxiety spirals when he considers being the first to take that step, fearing Nick might not reciprocate. Meanwhile, Nick has noticed Charlie's mental health decline. That, plus the stress of coming out to his dad, has made his own love confession a distant priority.