Doraemon (1979)

The Banner of Truth (26x38)

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Nobita gets misblamed by Kaminari for drawing on the walls of his house after picking up a chalk on the ground and comes late as a result, causing Sensei to punish him. After hearing Nobita's woes, Doraemon gives him the banner of truth which will make a person believe what the one holding it is saying. Nobita uses the banner to cause some mischief.