Kamen Rider 555 20th: Delta Protocol

In the present day, Syuji Mihara and Rina Abe continue their work as keepers of an orphanage previously under the control of Smart Brain. Many years have passed since the initial events of Mihara's adventures as Kamen Rider Delta, having passed on the belt to Naoya Kaido who then gave the Deltagear to a young Orphenoch named Hisao. However, after Hisao's demise at the hands of Rena Kurumi as Kamen Rider Muez, the Deltagear would remain without an owner.

Hearing the news, a heart-broken Mihara is thrust back into his fight against the Orphenoch when he is contacted by Masato Kusaka who was presumed dead- Now the president of Smart Brain, to fill in the role that the late Rena had once taken: An Enforcer of Smart Brain.

Now, Mihara must use the Deltagear and the newly created prototype Deltagear NEXT in order to combat rogue Orphenochs and uncover the secrets that lie behind the newly revamped Smart Brain Company.