Rei raises her pen, calls out the command and simply transforms into Sailor Mars.
First, Rei held up her Transformation Pen. She then held the pen over her chest, and long tongues of flame emitted from the Pen and formed fiery rings that passed down over her body. The rings tightened to form her entire outfit. Sailor Mars was then fully transformed, finishing with her classic pose.
Rei holds up her pen against the planet Mars against a red background. She shouts "Mars Power Make up!" and as she does that she lets go of the pen, bright rainbow colors come out of the pen and holds up her hand and her fingernails turn red. Similar to her Mars Star Power Make Up transformation. Rei's body turns into a purple silhouette color against the red background and she holds the pen up. Fire swirls around her and her back are turned and she is already clothed in her Sailor Mars uniform. She turns around and the Mars symbol appears on her forehead. Her tiara appears and then she strikes her ending pose.
As Rei called out the command, her Jewelry Star Bracelet changed from its smaller, sealed form into its full form, and the gems began to glow. She crossed her arms and her fingernails turned red, then she swept one arm over her head and her hair turned long and black and her leotard appeared. She then rotated as red flower petals floated around her, forming her choker and gloves. She spun once and her skirt appeared, then held up her arms as her bow materialized. With a sweep of her hand past her feet, her high heels appeared. She slowly moved into her finishing pose, her tiara appeared as her hand moved past her forehead. Flames and the Mars symbol appeared behind her once she completed the pose.
- Although Rei transformed into Sailor Mars in Act 3 of the manga, she did not say the phrase, "Mars Power, Make Up.
- This was the only transformation Rei used to transform in the live-action series.
- Rei is the only one whose hair color didn't change while transforming in the live-action series.