Giant naked people eating regular-sized people, and somehow it's one of the most emotionally devastating shows around.
Fun fact: Shōnen Jump rejected the manuscript before Kodansha published it and it sold over 110 million copies.
Lord of the Flies but with a girls' soccer team, and somehow the adults are even more unhinged.
Fun fact: The series draws from the 1972 Andes plane crash, where survivors resorted to cannibalism after 72 days.