Sideways is the Japanese remake of the Hollywood film of the same name, and going by the synopsis and character make up, it does seem a somewhat faithful adaptation, until the guests for today's stage appearance dispelled that assumption.
Here are cast members Fumiyo Kohinata and Rinko Kikuchi to tell you more during the stage appearance, with Cellin Gluck providing that surprise drop in halfway into the proceedings as well!
In Japanese, with English translation:
Part 1 of 3
Part 2 of 3
Part 3 of 3: Everyone pitching for their film!