If you are looking for the German or English version, the most reliable and legal sources are:
Unlike traditional "space operas" focused on war, this is a slice-of-life story. The focus is on how the diverse crew (including humans, aliens, and an AI) learns to live and work together.
Platforms like Kobo , Google Play Books , and Thalia offer the EPUB format, which is compatible with most e-readers like Tolino or PocketBook.