ふしぎの国の有栖川さん [Fushigi no Kuni no Arisugawa-san]

In this charming 2017–2019 Shueisha series, a high school boy discovers that his aloof classmate, Arisugawa-san, is actually a princess from a fantastical parallel world. Blending everyday school life with whimsical otherworldly adventures, the story unfolds over nine issues as the two navigate the boundaries between reality and wonder. Best known for its lighthearted tone and the creative vision of its original writer and artist, this short-lived manga offers a fresh twist on the isekai genre. It remains a fondly remembered, compact gem for fans of slice-of-life fantasy.