Complete secret room training - Beautiful wife kept by her brother-in-law

Usumire lives alone in her parents' old house and loves her husband's older brother, Ichiro, as if he were her own brother. Sumire used to visit Ichiro's house every now and then, but one day she entered a storehouse in a corner of the house and became trapped. Ichiro appears in front of Sumire with a cold expression on his face. When Ichiro was a child, he was imprisoned in a storehouse as punishment by his mother, and he harbored hatred and twisted love for Sumire, who resembled her mother. He then trains Sumire in the storehouse to clear up his thoughts.