The Valkyrie

Magical girl team that's finished their quest - which was A Mess - and have now taken on the work of helping younger, more inexperienced magical kids handle their powers and quests.

Their quest was pretty difficult. Four mortal girls given the power of Valkyrie, set on a quest to free Freyja from jotunn, only not all was as it seemed. Lots of norse mythology related stuff in that.