Nejimaki Seirei Senki: Tenkyou No Alderamin Site

The anime adaptation ends on a cliffhanger. The light novel's later volumes contain highly controversial plot developments that polarized the fanbase.

Deep character writing, realistic depictions of military fatigue/trauma, and a refreshing protagonist. Nejimaki Seirei Senki: Tenkyou no Alderamin

The original source material, spanning 14 volumes (completed). The anime adaptation ends on a cliffhanger