Discovering that your entire life has been a story is often a jarring experience, even for a bookworm who's read plenty of stories with that exact premise. Except she wasn't a villain set to die in a fantasy world or a side character once again set to die in a fantasy world, she was just Yamamoto Kotone, a senior student at Gyoseki Academy. She doesn't exactly know who she is in the grand scheme of things, apart from being a 'Big Sister' to the main character, but she likes it that way.
Sometimes it's better if a story remains simple.
[Cover Art is not mine, will credit artist as soon as artist is found.]