Natsumeki!!

For the sake of medical treatment for her younger sister, Natsume ending up moving from her home to Shikoku. In a place where no one knows her, she'll make her high school debut as a "cool beauty"!? This determined Natsume is approached by the wild child-like Yudai...

(Source: Shoujo Crusade)

Included one-shot:
Volume 8: Kiken Mania Prologue: Futari Hajimari