“It’s not like you have to be out there fighting banned books,” said Selvitelli, a high school senior. The group, which exists only in South Carolina, started as a book club. DAYLO members showed up to school board meetings to ask that books remain on the shelves. Nor is it an ordinary book club, said Emily Alaia, president of the chapter at Battery Creek High School in Beaufort. The book club followed it up with the 2017 novel “They Both Die at the End,” to contrast a more modern take on mental health, she said.