Ken-chan no Tanren
健ちやんの鍛鍊
There is no available record of the content of this manga, as it was never compiled into any form of published volumes. It was originally serialized in the January 1942 issue of the Shounen Club Magazine, which was published by Dai Nippon Yubenkai Kodansha. Due to the lack of compilation or further releases, no specific details about the story, characters, or themes can be confirmed.