In Act 49 of the Dream arc, Michiru raised her hand and yelled “Neptune Crystal Power!” to give power to Eternal Sailor Moon and then she transformed into a form similar to Eternal Sailor Moon’s called “Eternal Sailor Neptune” by fans along with the other Sailor Senshi.
In the Stars Arc, Michiru appears in her Eternal Sailor form but was never seen shouting a transformation phrase. However, it is presumed to be “Neptune Crystal Power, Make Up” just like the Inner Senshi.
In Amour Eternal, Michiru used this phrase to transform into Super Sailor Neptune.
Michiru transformed into her super sailor form in Sailor Moon Eternal along side the other Outer guardians.
- A similar transformation brought about by Hotaru's power happened in the fifth season of the anime.