I've been reading a bunch of manga and Japanese light novels, which have been something of a mixed bag, but the one I'm currently reading is actually quite good, despite the dark subject material. It's the first volume of a series called The Saga of Tanya the Evil, and revolves around an alternate version of World War I set in the early 20s where mages are a key part of combat.
A lot of the story revolves around a prodigious 10 year old 'German' mage called Tanya, who is noted for her ruthlessness, pragmatism, and even sadistic attitude, many even on her own side consider her a monster. In truth...she is actually the reincarnation of a Japanese HR manager from our universe who, after being murdered by a drug addict he fired, is confronted by a being who claims to be God, though the HR manager, a lifelong atheist, calls him Being X. Being X, blaming a lack of faith on modern conveniences, decides to reincarnate said manager as Tanya, as well as deliberately set things up to force Tanya to become an acolyte. Like, for example, creating a powerful magic focus that only works properly when you pray, and brainwashes you. So, Tanya's very like a darker version of Flashman or Ciaphas Cain.