'17 and Hello! Project at the end of their fall 2017 tour.[74][75]

On June 26, it was announced in a special episode of Hello! Project Station that Morito Chisaki had joined the group as a new 14th generation member and concurrent member from Country Girls.[76][77] She will begin activities with the group in the Hello! Project 2017 SUMMER concert tour and in their upcoming fall tour.[78][79]

Morning Musume '17 performed in the TV Tokyo Ongakusai 2017 on June 28[80] and Nippon TV's THE MUSIC DAY Negai ga Kanau Natsu on July 1.[81]

As part of their collaboration with marukome, Morning Musume '17 began airing a weekly 5-minute radio program titled marukome Morning Misoshiru Koeru yo! on July 1 across 38 stations.[82]

On July 15, Morning Musume '17 appeared with new member MoritoChisaki on TBS's Ongaku no Hi 2017 in two pre-recorded performances. Their first performance was solo, and the second was as a special Hello! Project unit with a selection of members from ANGERME, Kobushi Factory, and Tsubaki Factory.[83][84]

On October 4, they released Morito Chisaki's debut single and Kudo Haruka's last, titled "Jama Shinai de Here We Go! / Dokyuu no Go Sign / Wakain da shi!".

On November 3, a remake of Morning Musume's demo single, titled "Ai no Tane (20th Anniversary Ver.)", was digitally released exactly 20 years after the original. The remake is sung by the original five members and Morning Musume '17 as a special anniversary unit named Morning Musume 20th.[85]

As part of their 20th anniversary celebrations, Morning Musume '17 opened a limited time café named