It is important to clarify from the outset: is not a widely recognized standard textbook in the Japanese learning community (like Genki, Minna no Nihon, or Tobira). Searches for a specific "PDF 22" or "Portable" version often lead to dead links, user-uploaded content on file-sharing sites, or mislabeled resources.
The phrase (roughly translating to "To You Who Are Weak in Grammar" ) refers to a popular Japanese language textbook series published by The Japan Times . This series is specifically designed for beginner-level learners (typically N4 or N5) who are preparing to transition into intermediate studies. bunpou ga yowai anata e pdf 22 portable