Yuuto's Links
Yuuto is tolerant of Hisashi, since he is usually glued to Thales, but would prefer to not be around him. Hisashi is usually too energetic and playful. He especially dislikes the way Hisashi says 'Yuu', something about the tone he uses to say it really irks Yuuto. Hiashi is a good drinking partner, which is the only time he enjoys being around Hisashi.
Yuu always seems to be super grouchy and stressed. Hisashi would like to be friends with him, but isn't sure how to approach Yuu without making him mad. Thales appears to hold high respect for Yuu, but Hisashi isn't quite sure what to think or how to feel about him. It also seems to make him angrier when called by 'Yuu' instead of 'Yuuto'. However, Hisashi does think he's a lot of fun once they start drinking and he loosens up.
Thales is an incredible swordsman who inspires Yuuto to work harder. Seeing how highly their master respects Thales makes him feel envious, and he has tried to get closer to Thales to learn from him. Yuuto feels calmer with him around, and enjoys unwinding by drinking with him.
Yuu is held in high regards, as he also works under the same master as Thales and is also in a position of higher respect. While Yuu needs more experience before Thales will respect him in sword-wielding, he is impressed by how quickly and willing Yuu is to learn. Thales enjoys that Yuu is serious with a sword, but very calm and mild-mannered otherwise. Plus, Yuu is the only person who is a worthy challenger when it comes to drinking.