さあ、どっち？ (Saa, Docchi?)

Background
Saa, Docchi is a halloween song composed by Hinata Haruhana. It was made to celebrate Halloween also to enter the Project Diva Arcade submission. Later Saa Docchi was chosen to be featured in the game Project Diva Arcade.

On later 2011, the append version of the song (Len Append cold and Rin Append warm) was uploaded to Hinata Haruhana's Piapro account. Earlier, it was only featured in Hinata Haruhana's album Mechanical Mystery.

This song has no definite plot, it tells of two people who have different point of views. The main question was "Trick or treat" and Rin and Len replied differently.