Rona Chevalier
About
Rona Chevalier is the trusted Knight of Trident Principality who was assigned as Shion's partner when she set out to become an adventurer. Her secret mission was to make Shion realise the dangers of the outside world so that she would return back home.
It was during one such fabricated situations that she and Shion encountered Renya.
(Source: Young Again in Another World Wiki)