Hikaru Kimi no Tsuma ni Tensei shita no desu ga Noro wa Renai Tame ni Yotogi wo Kyohi Shite Imasu 【Kokoro Koi】

Hana Kazama is an office worker who loves 2D. She's obsessed with the manga "Prince! Hikaru-kun," based on the Tale of Genji, and has vowed to herself that she won't die until she sees the series' completion. However, one day, she finds herself transformed into Lady Aoi, Hikaru Genji's legal wife, whose pride prevents her from being completely honest... Learning that Lady Aoi will one day be cursed to death, Hana struggles to refuse his nighttime visits to prevent her from having a child with Hikaru Genji, which are the cause of this curse.

(Source: Natalie, translated)