Sex Friend 4 by Hukii [English, R18]

Fourth and final part of the "Sex Friend" series.

The story follows after Sex Friend 3. Mato visits his hometown only to be followed by Mai. Along the way she found out about Mato's family background. The two then proceed to contemplate their past while Ayana wakes up from her unconsciousness. Final part of the tragic story of Sex Friend series.