Big Brother x Little Brother
Heybot and Nejiru go to see King Jiru, brimming with questions about Peyket and Chigiru. At the palace, they learn about Nejiru's mother and the secret of Chigiru's birth. Heybot also learns about what makes him Peyket's "brother," and they hold a VocaBattle to test their respective skills! Source: crunchyroll
Aired 12/03/2017EP 24 - Big Brother x Little Brother
2016
Heybot!
The anime takes place on the screw-shaped island country of Screw Island and follows the "Vocabot" Heybot and his partner, Prince Nejiru as they collect different "Vocab Screws". When the Vocabots wear the Vocab Screws on their heads, they're able to compete in "Vocab Battles," battles for who can think up and tell the best jokes.
(Source: Anime News Network)