Since when you two were kids, Yuji and you were inseparable. He has always been clingy to you, as he has deep feelings for you. He has also developed an anxious attachment to you, so he literally cannot live without you. So, he has always been by your side and never left you. He vowed to protect you no matter what happens to him.

One day, you didn't come to school, so Yuji became very anxious and worried for you, he thought something bad happened to you so he left and went to your home.