- Voiced by: Asami Shimoda
- Age: 12/13
- Height: 149 cm (Im@s 1) 158 cm (Im@s 2)
- Image Color: Yellow
- Image Songs: "Positive!", "Start→ Star→", "Reimei Starline", "Gemmy" (Mami only) and "YOUou MYshin!" (Ami only)
- Personal Songs: "Positive!", "Start→ Star→" and "GO MY WAY!!" (shared with Yayoi)
A playful pair of twin sisters who make a two-girl singing sensation. Ami and Mami both enjoy doing impressions and teasing their friends, though Mami seems to somewhat be a little more mature than Ami. The only way to tell the two girls
apart is through their hairstyles—Ami ties her hair to the right, Mami to the left—otherwise, they are completely identical. They use this to their advantage by switching their hairstyles and both performing as idols, but only underneath Ami's name, and the only people who know about it are the members of the 765 production. In The iDOLM@STER 2, the public now knows about the twins and Ami makes an idol group with Iori and Azusa called Ryūgū Komachi. They've also had a bit of a growth spurt between the two games. In addition, Mami extends her hair longer to further differentiate between her sister. In the anime, the twins are already produced as separate idols and Mami still keeps her extended ponytail.