Can't tell plastics apart? Unsure if something belongs in the trash or the recycling bin? Meet PET: a super recycling helper robot created from nine-year-old Noboru Yamada's recycled plastic bottle. PET has been programmed to protect Noboru at all costs, even if it means creating more trouble in the process. Follow the misadventures of a young boy and his robot companion as they learn about the best recycling practices along the way. [Written by MAL Rewrite]

Makasete PET-kun was published in English as Leave it to PET! by VIZ Media under the VIZ Kids imprint from April 7, 2009 to January 5, 2010.