"Jishou Akuyaku Reijou" ni Korosareta Last Boss no Yarinaoshi: Bocchi na Reitetsu Koujo wa, Dai Ni no Jinsei de Riajuu wo Mezashimasu

Millie, rumored to be a cold and aloof princess who keeps others at a distance, is suddenly called the "final boss" by Angelina, who calls herself the "villainess," and is killed without understanding why. However, when she wakes up, she finds herself rewound to the world three years before she was killed. Millie vows revenge for her unjust death. But she might be killed again if she's alone... Thinking this, she decides to make "friends" who will help her, and tries to act more sociably than in her first life. However, Millie, who has lived alone her whole life, has a clumsy approach that backfires every time! Eventually, it develops into a huge commotion that involves everyone around her—!? A comedy fantasy about a clumsy young lady's second chance at life, starting with revenge, begins!!

(Source: Mangabox, translated)