Raburin, also known as Loverin, is a rabbit-shaped artificial intelligence device designed primarily as an alarm clock. It sports an integrated screen that displays the time and various other information. The character communicates verbally with Asahi Kashiwagi and others in the story.

Raburin plays a secondary narrative role, offering contextual information and commentary. Its screen displays expressive reactions, serving as comic censorship during scenes with nudity or sexual content. These reactions include specific facial expressions—an impressed look when covering larger body parts and a disappointed expression when covering smaller ones—providing visual humor in broadcast versions.

During thematic sequences, Raburin appears alone in instrumental ending themes, reinforcing its enduring presence as a narrative device. The character remains consistent in function and design across all appearances, with no significant evolution or explored backstory. Its artificial intelligence nature defines its interactions, though official media details no specific technical origins or developmental history.