The Sasazuka family whose parents are posted overseas. Because Kimihiko had to attend school, he and his younger sister Sarasa stayed here and looked after him while he was away. Kimihiko is being hit hard by Sarasa. It’s not that he hates it or anything, it’s just that “calico” has bothered him since he was a child, and it has become his daily routine. Due to this situation, he has come to like “quiet masochist girls” who are the exact opposite of “chintz”. He had been stocking up on SM adult goods online for the masochist girl he was destined to meet someday, but one day… Sarasa threw something at Kimihiko. “What is this? What on earth is this naughty thing? I found it in my brother’s room!” A set of goods is found in “Chintz”. “I’ll tell my mom! My brother said, “I’m buying these things with my allowance.” “Oh, that’s…” “If you don’t want that, listen to me.” Her sister threatened her with a faint smile on her face…