Likewise, Yuu has been known to call Hatori when worried about Chiaki, letting Hatori know when something seems to be wrong. However, even though Hatori dislikes Yuu, he respects his skills as a mangaka's assistant and will not hesitate to ask him for help in matters regarding Chiaki. Every time they meet, there is obvious tension between them, resulting in barbed insults and double-edged compliments. Though they are the best of friends, they also quarrel quite often, mostly over Yuu often making romantic or sexual advances on Chiaki. He suggests that Chiaki can fall in love with him if he has sex with him and again attempting to kiss and touch him. Despite these attempts, for a long time, Chiaki was unaware of how Yuu felt towards him, finding out only after Yuu had become drunk during their spa trip around Chiaki's birthday.
From the start, the two did not have a very good relationship and appeared to strongly dislike one another, though the reason why is initially unclear. He is also seen to wear glasses when he's working in the manga and often favors a light brown duster jacket when working with Chiaki. Ijuuin expressed his gratitude for helping him on short notice and regret that he couldn't give Yuu any day off. They have significant trouble when Yuu snaps and attempts to force himself onto Chiaki when alone in his home. This is similar to Hatori becoming a manga editor, as he did it also to stay close to Chiaki. Despite this, the two continue to remain good friends. Between the two, Chiaki has always relied on Yuu, stating that the latter is always doing things right.
. Chiaki begins to say he simply doesn't know, to which Yuu remarks that he very does know why. He mused that a lot of assistants quit after a short period but Yuu lasted longer than other assistants. It is known that Yuu has a crush on Chiaki, though Chiaki is oblivious to his feelings and only considers him a good friend. Yuu then begins to cry, demanding why Hatori is Chiaki's only exception in such an area. Yuu and Chiaki have been friends since junior high when bonding over their interest in books. It is speculated that their trouble with each other stated a result of their mutual desire to get close to Chiaki and have a rivalry to do so.
The main reason why they never get along is soon revealed to be because they are both in love with Chiaki and wished to have him as their own. After Chiaki leaves with a furious Hatori, who came to get him, Yuu then reels from being heartbroken. On the day Misaki ultimately rejected Ijuuin, Yuu dropped by at Ijuuin's studio to assist him with work. Chiaki, refusing, ends up punching him to get him off. Relationships Yuu has known Hatori since junior high school. .
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