Betrothed to My Sister's Ex

Betrothed to My Sister's Ex is a Japanese light novel series written by Tobirano and illustrated by Mai Murasaki. It began serialization online in October 2019 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Futabasha, who have published ten volumes since April 2020 under their M Novels f imprint. A manga adaptation with art by Chikage Nakakura has been serialized online via Futabasha's Gaugau Monster website since July 2020 and has been collected in ten tankōbon volumes. An anime television series adaptation produced by LandQ Studios aired from July to September 2025.