Haruma Kawagoe would be the greatest brother if his mother gave a birth to his little sister. Unfortunately, she lost the baby and his mother could never be pregnant again. Haruma was so sad, but he kept a prayer to get a little sister on that Christmas Eve.
Years passed by, and he’s a college student who live alone in the city now. One day, a sexy Santa Claus comes by and delivers him a present: a little sister!
It’s surprising, of course! But, Haruma is happy. There are a lot he wants to do with his new little sister.
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