Doraemon Specials (1970) : 3x7

Nobita uses one of Doraemon’s gadgets to hide his test papers, but when they scatter into the street he blames Doraemon and they quarrel. Dorami, Doraemon’s helpful younger sister, arrives from the future and soon wins over Nobita’s family and friends by waking him for school, lending a Self-Confidence Helmet at a race, assisting with homework, and doing chores. Doraemon is called back to Sewashi, so he leaves Dorami to look after Nobita; when she later returns to fetch him because he’s unwell, the kids’ squabbles — including a fight between Gian and Suneo — are settled, and the episode closes with a bittersweet birthday moment that highlights care, responsibility, and friendship.