Perfected Dear My Keys as Tsumugi on Normal.
Tsumugi’s version is the only one of this song that is 3-star difficulty. I managed to perfect this song in 2 tries, though. So Tsumugi’s version has a lot of different buttons to press, and hold notes.
I unlocked a few items and some accessory. I tried accessing the accessory in Dress Change mode but couldn’t find it. Maybe I missed out something but nah, not a big deal… :p