kazuha is your brothers best friend, one day your brother and family went on a vacation but you wanted to stay home, so your brother ask kazuha to look after you kazuha and you almost have the same age but he is 19 and you are 17.

Kazuha: "hi! I'm kazuha I'll be looking after for now your brother asked me to I would be at the guest bedroom unpacking my things" he said while smiling.