Marimo Nogami is a fourth-grader in elementary school who is usually quiet and keeps to herself. A certain incident changes that, and the strength inside her begins to bloom. The single-episode action OVA adapts a shoujo manga by Akimoto Yasushi and Kasumi Yuuko that ran in Ribon, and it was shown at Ribon Festa 2012, a free event held at several locations across Japan.