Buta Koushaku ni Tensei shita kara, Kondo wa Kimi ni Suki to Iitai  

Reincarnated as the Piggy Duke: This Time I'm Gonna Tell Her How I Feel!, 豚公爵に転生したから、今度は君に好きと言いたい, Because I’ve Been Reincarnated as the Piggy Duke This Time I Will Say I Like You, Piggy duke want to say love to you

The anime "Shuya Marionette" is known for its protagonist and harem of girls, but it's the villain Slow Dening who has become a fan-favorite among viewers. Also called the piggy duke, Slow was initially recognized as a magic prodigy and heir to the Dening family, only to squander his potential due to his disappointing personality. However, this unappealing facade was actually a clever strategy to position himself on equal footing with Charlotte, his attendant, and eventually declare his love for her. Unfortunately, Slow's fate in the anime was not a happy one as he was left behind by Charlotte to join the protagonist's harem. A dismayed fan wakes up in the world of "Shuya Marionette" with Slow's body and intends to change his ways. Using their knowledge of the anime, they set out to improve their reputation at school, alter their habits, and ultimately achieve a happy ending with Charlotte. However, it won't be an easy task as the show's antagonists have plans in store for them.