While their relationship is clearly one of mutual respect and affection, it remains platonic throughout the series.
* They share a bond: Yusei and Akiza have a strong connection built on their shared experiences and understanding of each other's struggles.
* No romantic scenes: The anime never depicts them engaging in romantic actions like kissing or expressing romantic feelings.
* Focus on friendship: The series emphasizes their friendship and their journey to overcome their individual challenges.
While some fans might interpret their relationship as potentially romantic, the official canon does not support that interpretation.