From the first minute of Netflix’s “Heartstopper,” the screen is saturated with blues and yellows, as scattered hand-drawn pastel leaves and flowers whirling across the screen. It’s clear early...

The first time I encountered Alice Oseman’s “Heartstopper” was during a trip to local bookstore Bookends & Beginnings last January. I was looking for a heartwarming queer read, and the clerk...