Sadly, There is no sequel to Chobits. However,If you have been collecting the volumes of the ipakita on Dvd and have collected 1-6, you are most likely talking about Chobits volume 7 Chat Room which is just Nawawala episodes filled with flashbacks of things we've already seen happen. However, It is not all bad becuase it includes the special short,Chibits. And there is also a fanfiction called Chobits 2 which some of them are posted on this site.But, if you are not talking about those there is no sequel, and if you are sure there is,GOOD LUCK FINDING ONE.