Yuuya's been noticing something strange about his little sister Moe lately. She's acting even weirder than usual, and the reason behind it becomes clear when a ghost possesses her body. But this isn't just any spirit: it's a playful, flirtatious entity with its own agenda and zero regard for personal boundaries. What starts as a supernatural inconvenience quickly spirals into an awkward Christmas Eve situation that forces Yuuya to confront just how complicated his feelings toward his sister really are. The episode leans hard into cringe comedy and fanservice, balancing genuine character moments with the kind of over-the-top scenarios that only exist in OVA specials. If you're looking for something that treats the supernatural as an excuse to push boundaries rather than explore genuine mystery, and you don't mind situations that veer into uncomfortable territory, this one delivers exactly what it promises. The comedy lands best for viewers comfortable with ecchi humor and sibling dynamics played entirely for laughs.