A family of five, a remarried couple with their stepchildren and three children (sisters close in age from the wife's side, and a college student boy from the husband's side) gather for breakfast. From noon, my parents decided to go on a trip to Atami for three days. That night, when my son came home and was relaxing, my youngest sister came into the room and rushed in. And from the next day, another sister joined me and had a 3P life with my sister-in-law. begins...
