In 2004 Aiba became a regular part of Ken Shimura's variety show "Tensai! Shimura Dōbutsuen". With co-hosts of the show such as Tomomitsu Yamaguchi, Sayaka Aoki and Becky, Aiba interacts with various wild animals such as tigers, pandas and crocodiles in zoos both in and out of Japan, such as Singapore, South Africa, Philippines and Indonesia. After Shimura's passing on March 29, 2020, Aiba was given the lead of the show. The name will remain for the show as a tribute to Shimura. As of June 3, 2020, NTV has decided to end the broadcasting of "Tensai!" in September, stating as a reason that to continue filming on that stage, with all the memories gathered throughout almost 16 years that the show was on air, would be painfully difficult and heartbreaking. However, Aiba would continue as host of a new program with basically the same theme: the love for animals. The new show, "", started airing in October.