This anime is about two sibling, Nagami Yuu and Suzuka. The older brother, Yuu wanted to become a light novel author, repeatedly sending proposals for his works to several existing publishers. But every proposal he sent always rejected. Suzuka, Yuu's sister, is a beautiful third-year high school student who has good grades and is the student council president and everyone's dream sister. Beautiful-looking, good at lessons and sports and very skilled in taking care of homework. And Suzuka fully supports whatever Yuu does, even though sometimes he is fussy with Yuu's bad habits.
One day, Suzuka wrote a novel about a younger sister who loved her older brother and suprisingly won in a light novel contest held online. The winner will be invited to the prize distribution and her work will be publish publicly. Suzuka wo was originally just a fad, was very suprise that her writing won and immediatel told her brother. She don't want that happen and ask for help from her brother in her work. After they discuss the matter, her older brother Yuu is the one who debuts as a proxy light novel author instead of Suzuka, under the pen name Chikai Towano
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