Context:

Ado's Shinzou performance featured a surprise guest appearance by Miku.

They performed a brand new song: 桜日和とタイムマシン ("Sakura Biyori to Time Machine" / "Cherry Blossom Weather and Time Machine")
written by Mafumafu (previously collabed with Ado on Kokoro to Iu Na no Fukakai)
with Miku tuned by Mitchie M (previously collabed with Ado on All Night Radio)
(Both have an extensive history as Vocaloid producers.)