My wife went back to her parents' home for a few days to care for her mother-in-law's health, and this was the last day with my older sister-in-law [Yui], who came to stay in her place. She whispered, "This is our secret... so... please don't tell my younger sister..." The moment when this forbidden relationship comes to an end, depicted in ultra-high-definition 4K footage. This product is a streaming version excerpted from ["Don't Tell..." Special Edition Yui Hatano].