Mitsuteru Sakaki  

, 榊光輝

Sakaki, also known as Captain Sakaki, is part of the Saint Ishiyama Club Captains Alliance and leads the kendo club. He's a junior like Shinjou and has long black hair that he usually keeps in a ponytail unless it's battle time. Dressed in his standard uniform from Ishiyama, Sakaki is reserved and doesn't talk much, even when supporting his fellow knights. In combat, he's a formidable opponent who can keep up with Aoi. He first appeared alongside Shinjou, confronting Oga in the halls of Saint Ishiyama. Despite their leader's fear being unknown at that time, Sakaki remained silent. It seems like he and Shinjou have a good relationship as they fought together with precision during their battle against Oga and Aoi.