Act 36. Infinity 10: Infinite ~Upper Atmosphere~ Bishôjo senshi Sêrâ Mûn Crystal : Season 3 Episode 11

Now that Professor Tomoe and Kaorinite have been destroyed, it is up to the eight Sailor Guardians to confront Mistress 9 directly and eradicate her once and for all. As Pharaoh 90's complete vesselization looms nearer, Hotaru's consciousness is determined to do whatever she possibly can to save Chibiusa and stop Mistress 9 from using her body for evil ends.