Ecchan arrives like a force of nature that the show never quite explains and doesn't need to. She's a ninja descendant who talks to animals, sleeps wherever she lands, and solves problems by being too competent and too weird for anyone to argue with. A 1971 magical girl show that doesn't care about origin stories or emotional stakes, just what happens when a girl who shouldn't exist decides your school is interesting enough to stay.
Ecchan arrives at Mitsuba Elementary School with no fixed home and a mysterious past. She's impossibly athletic, speaks fluently with animals, and claims descent from the legendary ninja Sarutobi Sasuke. Her constant companion Puku, a talking dog, vouches for her outrageous stories. When circumstances land her in Miko-chan's room, the arrangement seems doomed until Ecchan proves her worth by saving the household from a devastating fire. Grateful and impressed, Miko's family offers her shelter, and she finally plants roots in the school community. What follows is a blend of comedy and the supernatural as Ecchan navigates ordinary school life while her ninja heritage, animal connections, and magical abilities constantly threaten to reveal her true nature. She bonds with her classmates through her genuine kindness and remarkable talents, though her unconventional background makes her perpetually an outsider trying to fit in. The series finds humor in the collision between her extraordinary abilities and the mundane demands of being a student, creating a warmhearted comedy about belonging and acceptance.