[Reducing Mosaic]SUWK-012 The mother of the PTA president (43) who satisfies her sexual frustrations through weekly, one-hour secret karaoke trysts with her eldest son's young homeroom teacher. Mariko Koto.

Mariko is a PTA officer at a junior high school where the eldest son goes.One day, the chairman's proposal will launch a school festival, including his homeroom teacher.It was exciting at the izakaya of the first party and went to the karaoke of the second party.Meanwhile, Mariko, frustrated, looks at the eldest son's homeroom teacher.Tempted to take advantage of the older experience and motherhood.Eventually they have an affair relationship ...