Migawari no Hanayome wa Yandere Ryoushu ni Torawareru  

The Substitute Bride Is Captured by the Yandere Lord, 身代わりの花嫁はヤンデレ領主に囚われる

In place of her older sister who ran away, Lara, a member of the nobility, was dispatched to Lord Walter's castle. Despite anticipating mistreatment, she found that Walter developed an intense affection for her, as if her sister's elopement had never occurred in the first place. This is a fantasy involving other-worldly romantic love.