Based on the erotic game by Noesis.

Advanced series from Furifure The Animation.

In this second series, the story is more intensive, where the woman named Sumire (or her nickname is Sumi) became a prostitute in order to get money for her daily life. The regular customer is a teacher. Unwittingly the teacher turned out to be Sumi's brother. Then what will happen to both of them?

(Source: Translated and Edited from Nekopoi)