Misoji gibo: Haitoku no shitatari (2012)

Toshimi is married to Tatsuro, who has a son the same age as her, Kengo, and has an age difference with her husband. Every night, Kengo tries to maintain rationality when he hears Kimi's moans seeping into his bedroom.... Meanwhile, her childhood friend, Kaori, runs away from home after a quarrel with her husband and goes to live with him. Kiimi's childhood friend Kaori has run away from home after a dispute with her husband and moves in with her.