The night before entering high school, my sister came to my room and suddenly confessed to me. “Onii-chan, go out with me.” The first confession in my life was from my sister… I couldn’t say no when I saw my sister’s tears, so I went to the entrance ceremony with my answer on hold. My sister who goes to the same high school as me. How am I supposed to date my sister? A flirtatious love comedy between a super Brocon sister with superb comic skills and her kind, normal brother who is a nobody. ~Imagine if you could love a sister like that~