The phrase "" typically refers to a common consensus among manga readers that the original Japanese "raw" chapters of the series Gaishū Isshoku!
is a "slice-of-life" (mostly) story set in modern-day Japan, the vocabulary isn't overly bogged down by fantasy jargon or complex sci-fi terms. It’s actually a decent series for intermediate learners to test their reading comprehension. You can use OCR (Optical Character Recognition) tools to look up kanji on the fly! Where to find it?
: For a general overview of the series Volume list and plot details can be found on its official page.