S1·E21 The Rainbow-Colored Spectrum: Cure Cosmo's Power!

Realising that Eyeone is suffering as Darknest steals her consciousness, Hikaru retrieves the Aries Pen from Kappard but is still not powerful enough to defeat the Notrigger. However, Cure Cosmo is able to manifest the Rainbow Perfume and uses Aries' power to defeat the Notrigger and rescue Eyeone. After the Aries Star Princess is revived, Blue Cat, now going by her original name of Yuni, returns to Earth with the others to join their search for the Princess Star Color Pens. Meanwhile, back in the Notraiders' base, Darknest partially revives.