見えない煙を吐いている (Mienai Kemuri o Haiteiru)

Emitting Invisible Smoke is a song sung by Rin Kagamine and Len Kagamine. It is the two-hundred-and-fifteenth track in Other Vocaloid Songs 12: Mostly Rin Volume 2 and the two-hundred-and-twenty-eighth track in Other Vocaloid Songs 26: Mostly Len Volume 2.