Sakaki is a member of the Saint Ishiyama Club Captain's Alliance and captain of the kendo club. He is a Junior like his comrade Shinjou. He is indifferent in battle and in conversation and rarely speaks even to back up one of his fellow knights. He is a powerful opponent and has shown to be able to keep up with the likes of Aoi in battle. He was first shown partnered with Shinjou, confronting Oga in the halls of Saint Ishiyama. He seems to be on good terms with Shinjou as they fought Oga and Aoi with precise movements. It is still unknown whether he shares a common fear of their leader as he was still silent when he showed up.