I erased them. And I started the journey.

Either buy the damn book, or skip it and start reading Yotsuba&! with a dictionary. The PDF isn't coming.

The consensus seems to be: The PDF is a tease. Because Chuukyuu e Ikou is designed for classroom pair-work (listening to a partner, reacting to a prompt), doing it alone with a grainy scan is like learning to swim by reading a manual in a sandbox.

"Does anyone have the PDF for Chuukyuu e Ikou?"

Learners search for Chuukyuu e Ikou specifically because they know it is the only structured bridge out of that desert. They aren't looking to steal from a corporation; they are looking to survive a plateau. They want a scaffold. And when they can't find the PDF, many of them quit.

"The scans were crooked." "Page 47 was missing." "The audio files were labeled Track 1, Track 45, Track 2."

If you are searching for it right now, I see you. I feel your frustration. But stop scrolling through Reddit at 2 AM.

That is the hidden tragedy of this search query. The inability to find the next step kills more language learners than difficult kanji ever will. I have spoken to a few people who actually found the PDF. They describe it with a kind of haunted disappointment.