A special unaired episode included in the 7th DVD/Blu-ray volume.

Second season of Mitsudomoe.

Ichigo Momomiya expected her date with her crush, Masaya Aoyama, to have a more romantic ending than her falling asleep after she sees a vision of a cat entering her body. Things get even stranger when, the next day, she begins displaying cat-like behaviors such as an intense craving for fish. When Masaya is attacked by a monster, she discovers that she is able to transform into the cat-eared magical girl, Mew Ichigo. After she saves Masaya, two researchers named Ryou Shirogane and Keiichiro Akasaka approach her and reveal they had injected her with Iriomote Cat DNA in order to create a magical girl that can save the world from aliens. Ichigo is tasked with fighting these monsters, but saving the world proves to be just too much for Ichigo to handle by herself. Fortunately, she learns that there are four other girls just like her, and now, Ichigo must find them quickly before the aliens completely take over the planet. [Written by MAL Rewrite]

Following the line of the precedent OVAs (of the same name) This anime goes around the normal lives of some elementary school (5th grade, 2nd class room) kids and their adventures, while turning to teens. Their games, stupid jokes, and the misunderstandings around their premature attraction to the opposite sex. Ryota Satou is the main character here, but his friends are almost as important as him since the school wouldn't be the same without them, especially the girls who the majority of time appear to be mature by their ages but in the ends they are as childish and even more "dangerous" than the boys. (Source: ANN, edited)