Everything started with a kid of 7 years, Tsukasa, he lived with his mother, father and younger sister Saki, unfortunately Tsukasa had very strict and perfectionist parents, they would only be proud of him if things went perfect. One day in the kitchen, Tsukasa and his parents were talking with Tsukasa about his grades

Sr Tenma: Tsukasa, How did you do in your final exams? You won't disappoint me, right?