Update 4.0.0 was released on (NA/EU) and November 30, 2018 (JP). It is the crown jewel of post-launch support. Here’s what it added:
Numerous bug fixes and balancing tweaks to ensure a smooth gameplay experience. Understanding the Version Number (4.0.0a)
Francisca, Flamberge, and Zan Partizanne become unlockable allies after completing specific challenges. 2. Heroes in Another Dimension (New Mode)