Wife-in-law lesbian training

Tomomi (Rinne) has decided to marry the man she loves and is now living with her mother-in-law Reiko (Yudou) at her husband's parents' home. Reiko smiles kindly at Tomomi, who is happy that her family has grown, but... However, one month later, her husband Kenichi is suddenly ordered to go on an overseas business trip. Left behind by her husband, Tomomi is absent-minded and unable to do housework, and is scolded by Reiko. From that day on, Tomomi felt that Reiko's behavior became strange. Without realizing that everything was a carefully prepared trap...