Eleanor Oujo wa Jiyuuna Seishun wo Okuritai: Isekai Trip de JK Life

Her life determined by birth, Eleanor Sky Eta, princess of the Eta Kingdom. Her only pleasure is reading the memoirs about a strange school, the author of which is unknown. On the eve of her political marriage, Kiran, a wild ferret she had adopted, leads her to a portal where she falls in... and finds herself transported to a high school in modern Japan...! A reverse isekai x unpredictable coming-of-age school story, about a princess facing new life full of "firsts." (Source: Comic BRise, translated) Note: Chapter count includes two bonus chapters.