"SS -扉の向こうのその先へ-" (SS - Tobira no Mukou no Sono Saki he-) is Shigotoshite-P's second album, the previous being FILL e TUA. The album focuses on classical and folk songs with MEIKO, KAITO, Nekomura Iroha and Kagamine Rin/Len as the vocals.
It consist of 15 tracks, 5 new songs, and 10 published songs from the (all of which had been fully re-mastered) featuring tracks such as Rin's Girl and the Black Cat, MEIKO and KAITO's The Dawn in the East, The Dusk in the West and Iroha's Behind the Door.
It was released on March 25 in VOC@LOID PARADISE along with Shanmerii's doujinshi and is purchasable in Toranoana. The crossfade can be heard in Nico Nico Douga, and its official site can be seen here.