あらすじ
Before the fall, and before the trials of “the Titan’s son” Kuklo, a young smith by the name of Angel Aaltonen grappled with the giants as only a craftsman could … This story predates where the Attack on Titan: Before the Fall manga series begins. 1) Anheru works at a workshop creating protective gear/weapons for the scouting legion (the story is set before the 3D maneuver gear was invented). Anheru is a first class weapons craftsman, and therefore has direct access and also is involved in the ongoings within the scouting legion.
あらすじはAniListより（英語）。