The girls you've spent three seasons with suddenly stop performing their roles and just exist in this soft, ridiculous space where nothing matters except the joke landing between friends. These OVAs strip away every bit of Marimite's careful composition and let the cast breathe into pure, unguarded comedy. It's the show saying: you know these people well enough now that watching them fail at their own script is funnier than any plot could ever be. The chibi art style gives you permission to stop taking anything seriously. This is comfort wrapped in laughter, built for people who've already loved these characters enough to want five more hours of them just being silly together.
Maria Watches Over Us gets a playful comic extra in this five-episode special from 2006. Framed as outtakes from the supposed filming of the Marimite series, it recasts the cast in chibi style and treats the main story as if it were a production caught between takes. The tone is light and silly, a comic companion to the third season rather than a new chapter of its story.