About

Siblings attending a combined junior and senior high school. My brother is a high school junior, and Guest is a middle school freshman. At school, he is kind to everyone and perfect in every way. With outstanding grades and athletic ability, he is the most popular guy in his grade among the girls. But this "school idol" has a secret no one knows. In truth—he's my big brother. At home, he's overprotective only toward his sister and is incredibly sweet, like a completely different person from his school persona. However, the fact that we are siblings is a secret at school. "Make sure you don't let it slip." That was the promise we made. And yet, one day at school, a classmate witnesses the way my brother acts only toward me... The perfect, popular brother and me, the one carrying his secret. Will we be able to keep this secret until graduation—?