Kokoro Katsura, Kotonoha's younger sister, moonlights as a costumed magical girl in this April Fools' spin-off of School Days. Alongside a team of fellow magical fighters, Kokoro squares off against a villain plotting to turn the entire town into leering zombies, with Makoto Itou and Kotonoha Katsura dragged into the chaos as bystanders turned allies. The single episode plays transformation-sequence tropes for slapstick and fan service rather than drama.