Wood Stick is a music recording studio located in Karuizawa that has a reputation for being top-rate regarding musical talent and technique.
It is apparently popular with many celebrities who go there to record songs. Apparently a well-known foreign celebrity came over to use it, which increased its international reputation, for now many other foreigners come over to use its facilities. Both Sho Fuwa and Vie Ghoul use the studio for recording purposes.
Despite their top-rate reputation the people who make up Wood Stick are not infallible. One of them becomes a spy for Vie Ghoul, stealing Sho's new song for them.