It is a bit ambiguous in this case.
We found unfinished non-core content:
Sekai Seifuku: Bouryaku no Zvezda - Comic Anthology (Other)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Anime - Base
Release date: January 12, 2014
Anime - Sequel
Release date: October 15, 2014
A young runaway named Asuta stumbles upon Kate, a mysterious girl with grand ambitions.
Kate, who leads a secret organization called Zvezda, seeks world domination and recruits Asuta, giving him the codename "Dva."
Dva finds himself embroiled in Zvezda's unusual activities, surrounded by eccentric members, as they try to achieve their goal.
Standing in their way is "White Light," a powerful force for justice, and the Japanese government, making their mission incredibly difficult.
The anime follows Zvezda's journey as they attempt to conquer the world despite overwhelming odds.