Mortem ad Wrens

The first installment in When Good People Go to War. Crossposted on ao3, ff.net, and tumble under same username
Akira told themself they would become a hero to protect children from their corrupt society and to take down their family. Now, attending UA high school, they're discovering the nuances of hero culture and limelight heroes. Follow their journey as Akira finds themselves fighting on multiple fronts against enemies seen and unseen.

Or: chaotic street rat gets into UA and tries to keep people from discovering their past and present while scheming for their future