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Nội dung:

Manga 

1. https://ttmanga.com/Manga/ojiichan-shinanai-2660
2. http://www.hamtruyentranh.net/truyen/ojiichan-shinanai-3127.html
3. https://mangakakalot.com/read-ws4ci158504942599
4. http://nhattruyen.com/truyen-tranh/ojiichan-shinanai-17951

Anime:

Light Novel: