So... is Seikon no Qwaser finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 28, 2011
Manga finished: July 19, 2016
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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:
Seikon no Qwaser
The Qwaser of Stigmata
Anime - Base
Release date: January 10, 2010
Seikon no Qwaser II
The Qwaser of Stigmata II
Anime - Sequel
Release date: April 12, 2011
Synopsis
Tomo and Mafuyu's lives are turned upside down when their father's disappearance coincides with strange occurrences at their academy. Rumors of a serial killer targeting female students create an atmosphere of fear.
One fateful night, they encounter Sasha, a mysterious silver-haired boy with unusual powers. They soon discover Sasha is a Qwaser, capable of manipulating iron through a strange energy source.
Mafuyu finds herself drawn into Sasha's world, uncovering a hidden conflict involving other Qwasers and the power they wield.
The sisters' ordinary school life is shattered as they become entangled in a dangerous battle, where the secrets surrounding the icon and the other Qwasers threaten to consume them.