Please don't worry about post-purchase upgrades of Drupal or about maintenance support. As the first official supporting partner of Drupal amongst Japanese companies, we take care of maintenance support and introductions to Drupal in Japan. Our staff have great experience of Drupal and offer total support from introduction to practical use.
Drupal has been adopted by Japanese companies in many industries and business categories.
We published "TECHNICAL MASTER Beginner's iOS App Development Swift Version", which allows even those without program development experience to learn the methods for developing basic iOS apps by simply following the instructions.
The code patterns required to understand how to write the most often-used CakePHP for practical development and other "tasty tidbits" are cordially explained in the form of a "recipe".