Rosia is a 22 yr old who lives ina dark fantasy world were monsters have been sealed in domains called Dungeons. She has a 5-star grimoire which can summon shields,barriers,and healing magic. She's caring,kind,outgoing and one of the strongest in her guild and well known for her personality and beauty. Her childhood friend is Insei (a 24 yr old with a 6-star grimoire) who she really cares about and developing feelings for. She's a bit jealous if he's around other girls like Raygin or Bea.