Yuki Kitazawa

In the anime "Gravitation", Yuki Kitazawa is the man from Eiri Yuki's past who caused all of his emotional issues. He was his tutor in America, since Yuki was sent there to study because of his non-Japanese looks. Kitazawa always seemed to be a cool, collected and generally happy person with no wrong intentions. Although his dark side emerges when he drinks, which is when Yuki happened to come to him at the wrong time.

tory

Kitazawa was Eiri Uesugi's tutor while Eiri lived in America with Tohma Seguchi. It was shown in the manga that Eiri and Kitazawa had a happy and friendly teacher and student relationship. The relationship often appeared more as friendship, despite that Eiri called Kitazawa "sensei". Underneath all of this though, It is shown in the manga for Yuki Kitazawa to have more immoral intentions. It is shown that Yuki Kitazawa has taken his liking of Eiri to a more pedophiliac level.

Later on in both the manga and the anime, it shows Kitazawa Yuki dropping a bottle during the time he had Eiri trapped inside of the dark apartment one night. This suggests that Kitazawa was actually intoxicated when he decided to act upon his more immoral thoughts toward Eiri. Which normally, as said in the manga, Kitazawa realized Eiri was still too young. Alcohol, taking away rational thought. Two men however entered the scene and he let them, shallow price of 10 dollars, go 'first'.

In what is determined to be a fit of fear, as well as anger, panic, but most commonly assumed as defence, Eiri managed to get ahold of a gun and shoot Kitazawa. Kitazawa's life ended shortly after. Still, afterward it has left scars on Eiri that he will carry for the rest of his life.

Tohma Seguchi was the one who found Eiri at the apartment and comforted him afterward. He feels responsible for what happened to Eiri because he was the one who hired Kitazawa as his tutor, and feels that he didn't look into him enough and could have prevented the disaster. This is a common assumption as to why Tohma is often so concerned and concentrated on Eiri's health and personal life while he is grown.

On Eiri's part, it is shown that he had cared for Kitazawa, but it not clearly shown whether it was a love or just a friendship he desired. Eiri later took on Kitazawa's first name, Yuki, as his pen name.

However, in the manga, it's shown that actually Eiri had a deep affection for his tutor. Which is often a reason why most people assume Eiri was not as resistant until others were brought into the scene. Though it clearly shows in both the manga and the anime that Eiri was shocked, and possibly fearful.

Kitazawa has a younger brother called Yoshiki, who is an MTF transsexual. In Gravitation 2, it is also revealed that he has a young son named Riku.