Doraemon (1979)

Object Electrical Transmission Adapter (5x30)

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Dekisugi gets an 85 on his test much to the shock of everyone else in the class. Shizuka comes to Nobita's house and explains to him and Doraemon that Dekisugi got a call from someone who's blackmailing him. Nobita and Doraemon travel several hours into the future to Dekisugi's room and use the Object Electrical Transmission Adapter to find out who the culprit is. Remade as It's Solved! The Dekisugi Case in the 2005 series.