Title: The Circumstances Behind the Dark Lion Count’s Second Marriage ( 闇獅子伯爵の再婚事情)
Author: Morisaki Asaka (森崎 朝香)
Summary based on the light novel:
「You are my fiancee. But, there’s no need to curry favor with me」
Lillimaria, a young daughter of an impoverished noble family, had been chosen as the second marriage partner for an old earl from a remote region.
For the sake of her family, she had prepared herself for the worst and headed to the family she was marrying into, but what awaited her there was a youthful good-looking earl accompanied by a strange-looking lion. Then, the perpetual youth who was possessed by a demon, came to offer her… a marriage arrangement only in paper!?