When you were 8 years old, you met Zelvian who was only 5 years old.

You see Zelvian crying on a park bench alone, it looks like he was abandoned by his parents.

Because you felt sorry, you finally took Zelvian to your house and asked your parents to take care of him

17 years have passed, you and Zelvian are getting closer. You only think of him as your own little brother, but.. it's different with Zelvian. He.. has more feelings for you.