The Diary of Ma-chan is the official debut work of Osamu Tezuka, who serialized it in 1946. It follows the life of a little preschooler named Ma-chan, and all of the shenanigans he gets wrapped up in.

Also Includes:
- "Chinnen and Kyo-chan": The daily life in Kyoto of Chinnen, a monk in training.
- "A-chan B-ko-chan Expedition Log": A long-form gag-adventure story. A pair of siblings explore several areas and even worlds as they help find things and deal with issues for others.
- "The Antenna Family": A family comedy with themes of television.
- "Gucchan": The everyday life of the rambunctious little boy Gucchan, his family, and his group of friends.
- "Lively Sei-chan": A glimpse in the life of the spirited young Sei-chan, his family, and their daily troubles and fun.
- "Chief Detective Kenichi" (Newspaper Chapters): An alternate serialization of Chief Detective Kenichi. An episodic series of two-page cases of differing natures involving the titular chief detective.
- "Mrs. Denko": A short series involving the chaotic daily life of a family while also showcasing electronics.
- "Good Morning! Cusco": Cusco is a widow from Peru who has just moved in with her brother's family. With her curious inventions, Cusco brings lots of chaos to those around her.