Naeho's daughter has a husband named Atsushi. Furthermore, her daughter is five months pregnant, and for Naeho, who lost her husband early, it was a happy life with her three-family members. However, one day, when Naeho got out of the bath, she found Atsushi going through her underwear. Atsushi hurriedly fled. From that day on, the mother, daughter, and son-in-law began to develop an indecent triangular relationship…
