"On a trip to the hot springs for the first time in a long time as a family reunion, I ended up having physical relationships with all of my family members... But even now, the lewd and embarrassing part of me is irreplaceable to anything I tasted that day. I remember the excitement and pleasure…” Father, mother and two sons. The Tamura family, who visited the mountain villa in the fresh green with four family members, will spend a day filled with taboos that they will never forget for the rest of their lives.