This is a first time for the group!
The original members of Morning Musume met (eighteen years later) to perform a new version of their first single, Ai no Tane (愛の種 ; seeds of love), with current members of Morning Musume. ’17. This new version is titled Ai no Tane (20th Anniversary Ver.) and will be released on November 3, 2017, in digital format, on iTunes.
This special sub-unit is named « Morning Musume. 20th », to celebrate the 20th anniversary of this song and the group.