Moto Sentouyou Dorei desu ga, Tasukete Kureta Ryuujin wa Tsugai Dasou desu
Once A Fighter Slave, Now Mate to the Dragonkin Who Freed Me·元戦闘用奴隷ですが、助けてくれた竜人は番だそうです。
Eight has spent her life as a slave forced to battle in an arena. Her circumstances shift when a group of soldiers attacks the arena, with a Dragonkin named Celeste at their head. During the chaos, Eight fights against her master, an act that leads Celeste to recognize her as his fated mate.