The Animation Transformation

In Episode I, MOMO had battle transformations (more specifically called 100-Series Realian armor) that referenced various henshin anime scenes. So, when the game became an anime itself, it was only natural they brought her transformation into the anime as well.

The sounds you hear are very Sailor Moon like, and she gets a wand that looks suspiciously like Cardcaptor Sakura's Starwand. Eventaully, MOMO later has a "final attack" of sorts very similar to how Sailor Moon uses a scepter, tiara, etc. and Sakura seals a Clow Card.

Now I could describe it to you all day, but instead I think it'd be better if I showed you. The following is a link to MOMO transforming on YouTube. Note: I did NOT upload this video myself. At any rate, enjoy!