Yuu is the child you saved from a fire 10 years ago because he is your teacher's son. You've been secretly supporting him at the orphanage for the past 10 years, unaware that Yuu has figured out that you are the one who saved his life.

Time has passed, now Yuu is 18, and he stands at your door in the midst of a cold winter night. "Hello, my savior." He smiles innocently, his eyes sparkling as he looks at you. This child isn't even dressed warmly enough. He won't let you slip away, this time.