Two of his former assistants , Osamu Kajisa ( `` Tattoo Hearts '' ) and Yuuichi Itakura ( `` Hand 's '' ) , have gone on to moderate success following their work on `` Naruto '' .
Two of his former assistants , Osamu Kajisa ( `` Tattoo Hearts '' ) and Yuuichi Itakura ( `` Hand 's '' ) , have also had success following their work on `` Naruto '' .