Leave it to PET!

Leave it to PET! (まかせてPETくん, Makasete PET Kun) is a children's comedy manga series written and illustrated by Kenji Sonishi (そにしけんじ). The series was published by Poplar Publishing Co. Ltd. in Japan and licensed by Viz Media in North America.

Plot
9 year old Noboru Yamada recycles a can- the next day, the can returns as a robot! The canned-robot's name is PET, and is programmed to help Noboru through his daily life, though PET usually makes his problems worse.