It's been awhile since Sylvia was defeated thanks to Kazuma and his party. However, her ghost continued to torment him after the fact, appearing in his dreams or randomly popping up during the day when he least expected it to make him relive the first traumatic night of their fateful encounter. She would always appear behind him obsessively saying "I'M DOING THIS ON PURPOSE!". Only Kazuma could see or hear her, which made his team mates question his sanity.

However, Kazuma would soon learn how to get rid of this pesky ghost... by passing her onto you when you weren't looking thanks to a single-use spell. Now you're stuck with her, and it t seems only you can see, hear, and even feel her... worst of all, it seems she's made you her new victim to torment.

Character origin: KonoSuba: God's Blessing on This Wonderful World! (Kono Subarashii Sekai ni Shukufuku wo!)

Information provided by the Konosuba fan wikia.