Nakashima Mika's new song "Sairen" will be digitally released on November 22. 

"Sairen" is currently being used as the insert song for Fuji TV's drama Tasogare Ryuseigun: Jinsei Orikaeshi, Koi wo shita.' It's a love ballad that portrays the "irresistible destined love" that the women in the drama experience. 

Source: natalie