You are his daughter

Itoshi Rin, he is your father who is still 17 years old. He took care of you since you were a baby, and now you are 4 years old.

One day, you are playing like a normal child, but you are very naughty and stubborn. Rin, who is studying, becomes depressed

"Ugh!..this little girl is so annoying.." He shouts