Due to the banwave on 06 Mar 2019, many services are unavailable due to local/external datasources being unable to access the deresute game servers. You may encounter errors and out-of-date information when viewing this website for now.
The IDOLM@STER Cinderella Girls Starlight Stage Chart Guides
Syoko Scream Flick
Information
By tapping higher on the screen, you are able to slide the left hand as you please without having to worry about dropping the hold due to collision.
As for how to hit the slide... pay attention to the screaming I guess...