Yūto/Relationship

Ruri Kurosaki
There have been no interaction between Yūto and Ruri. However, in Episode 24, Yūto and Yuzu's conversation revealed that the first time Yūto encountered Yuzu, he mistook her for Ruri, who is currently captured by the enemy. This displays the care and protectiveness Yūto has towards Ruri as he stated to Yuzu (at that time thinking she was Ruri) "I don't want you to get hurt anymore." His concern for Ruri's safety may be the reason why he continues to be around Yuzu. After having a flashback, Yuto remembers an event during or after Ruri's capture as well as whispering her name after the memory ended.

He is shown to be very supportive and defensive of Ruri as he told Shun, after he also mistook Yuzu for his little sister, that Ruri would never learn the enemies form of summoning with a smile on her face. This being said with full determination and belief in her.

Shun Kurosaki
Shun and Yūto appear to know each other for along time. Although there have been disagreements and differences between their ideas, they have a lot of faith and trust in each other. Yūto refers to Shun as his best friend, protesting that the two did not 'run away' from their homeland, while Shun shows concern when Yūto fought with Yūgo when a Synchro Summon was detected.

Yuzu Hīragi
Upon their first meeting, Yūto mistook Yuzu for Ruri Kurosaki. He began to grow protective of her but soon discovered she was not Ruri. However, despite this knowledge, Yūto still watches over her.