Otoshima Kasane

Yuu is an otaku who is into foreign dramas. She was stricken with grief when her beloved oshi from one of her favorite Chinese dramas died. However, in an accident, she is transmigrated as Ling Ning, the court lady who serves her oshi. Yuu will use her past life's knowledge to make every effort to ensure that her oshi lives. Supported by companions with distinctive personalities will she be able to make sure her oshi survives?

What awaited our protagonist who was summoned to another world as just an add-on for the "saint" was a forced marriage with a bird man who exuded poison form head to toe? Rui Kanzaki is summoned to another world alongside her twin sister. While her sister, who has aptitude for all kinds of magic, is treated as a "saint," Rui, who has no aptitude for magic and only has "poison resistance," is treated poorly. One day, Rui is forced to take her sister's place as a bride to the emperor of a neighboring country rampant with beastmen. The emperor is a man who has the blood of a poisonous demon bird, and is himself known as the "Emperor of Poison," a man whose entire body is covered in deadly poison. A "political marriage" between a lonely king and a substitute saint. Their fates, which should have never crossed, gradually begin to intertwine.