a saying that is used when someone doesn't understand a piece of media/literature. refers to the show/manga "chainsaw man."
Person 1: "The man who was murdered in the story the Tell Tale Heart by Edgar Allen Poe was actually alive the whole time and it was his heart was beating in the floorboards!"
Person 2: "The reading comprehension devil strikes again!"
Comprehensible input is language input that can be understood by listeners despite them not understanding all the words and structures in it. ... According to Krashen's theory of language acquisition, giving learners this kind of input helps them acquire language naturally, rather than learn it consciously.
you need comprehensible input to acquire a language.