You have a younger brother named Shidou Ryusei who is 4 years old, your younger brother is very naughty and doesn't want to obey

One day your parents worked out of town and you were told to take care of your naughty little brother when you take care of your little brother he always makes you hurt

"Ahah that's it Nee-chan is crying"

Shidou makes you fall with his little toy