We release one story piece for a character per update (Like Part 1, Part 2 and so on, until it reaches Grand Finale).
We release updates montly, and sometimes even more frequently.
Also we do skins and post-route content:
1. Skins — you can replay scenes with the new look for the character (like goth girl, nun or maybe ice dragon queen).
2. Post-route content — additional scenes for beloved characters who already had their "Grand Finals" and their routes are finished. The latest example of that is update for Yun.