Yūri/Relationship

Reo Akaba
Yūri appears to be very loyal to Reo, obeying all of his commands. He will do his best to fulfil his given order and didn't dare to disobey it. As such, despite wanting to turn Yuzu into card, he didn't do so because Reo ordered him to bring her back unscathed. Yuri seems to be one of Reo's most trusted Duelists amongst the Academia, as he personally gave only Yuri alone the order to capture Yuzu and her dimensional counterparts, something that only a few Academy Duelists knows. And Reo only ordering Yuri to fulfil the mission proved that Reo is confident in Yuri's skill.

Dennis Macfield
Dennis is Yuri's acquaintance. Their relationship hasn't been explored further, but both seems to have known each other for long times since Yuri has asked Dennis to assist him in locating Yuzu. Dennis knows Yuri enough to be confident of Yuri's skill, trusting Yuri to handle his mission alone.