If you want the convenience of a digital file without breaking the law (or getting a virus), you have options.
Don't start with the dialogues. Daichi lists vocabulary by part of speech. Use a flashcard app (like Anki) to memorize the nouns, verbs (ます form), and adjectives for the lesson. If you have the translation supplement PDF, refer to it here.
Whether you find a digital copy or buy the hardcover, using Daichi correctly is vital. Here is a study roadmap:
Unlike a physical index, a PDF allows you to search for a specific kanji or grammar point (e.g., "te-form" or "kara") immediately. This is a massive advantage for quick revision.
Here is the cold truth: There is no legal, free PDF of Nihongo Shokyu 1 Daichi available for public download.
The Japan Foundation and its distributors (like Bonjinsha) have been aggressive in protecting their copyright. While you will find uploaded scans on file-sharing sites, torrent trackers, and random blogspot links, these are pirated copies.
