Chained - [Haikyuu!!] Oikawa Tooru x OC

Nakano Usagi believed in True Mates, as her parents were a pair. In fact, her mom often would tell the story of how she met her father. As the youngest of three, she was the one who believed it the most. However, when she transferred as a third year to Aoba Johsai and found out her True Mate was the one and only Oikawa Tooru, her response was complete and utter horror and disgust. So here begins the story of The Great King trying to woo his True Mate, who refuses to believe that they are. [A/B/O Dynamics]