The primary reason for its popularity is its commitment to immersion. The main textbook does not contain a single word of English (or any other language). It forces the student to rely on pictures, context, and grammar explanations from a separate volume to understand the text. While this sounds difficult, it trains the learner to think in Japanese rather than translating in their head.

What makes this textbook unique is its "immersion-first" philosophy. The Main Textbook (Honsatsu)

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