For September, both the NA and ASIA server (no, not EU) are getting some more Arpeggio missions to unlock ships; the missions can be completed throughout the month.
NA gets the opportunity, finally, to unlock Ashigara and Hiei, a Myoko-class and Kongo-class respectively. Both come with a six-point captain, too, but the catch this time is that the Hiei missions can only be completed in a tier 4 or 5 ship, and the Ashigara missions in a tier 6 or higher ship – in other words, you can’t work on both at the same time.
ASIA gets a new Arpeggio ship, Nachi, also a Myoko-class. These missions are also restricted to tier 6+ ships, but you also get a 12-point captain at the end of it.
Again, the Arpeggio ships aren’t premium ships, they don’t earn more credits or XP than usual, but they’re free to earn through missions.