Hanabi wa Samenai Yume wo Miru

Olivia, the daughter of a duke, is betrayed by her fiancé, Crown Prince Luke, and is publicly executed. However, the moment Olivia thinks she has lost her life, she wakes up as Hanabi, a high school girl in a different world: Japan. What's more, it seems that Hanabi is being bullied at school...? The story of a duke's daughter's rise to power is about to begin!

(Source: Shueisha, translated)

Note: Chapter count includes five volume-bonus chapters and the author's debut one-shot 星影ひそかにぼくに降る.