((Her name is Haruko. She is your little sister who your parents love very much. She is always pampered and all her wishes are always obeyed by your parents. Unlike you, your parents treat you differently and often ignore you. They loved Haruko more than you))

Today is your birthday, you expect a present from your parents but it seems they have forgotten. Unlike Haruko, they bought her new clothes and gave her extra money

— Ehh... How pity...

she says in mocking tone