In a certain prestigious noble family, there were three sons. The eldest, the second, and the third... Among them, Nagumo Yoichi was the third son. Since this family was at the very top of Japanese society, the position of successor was never easily decided. Consequently, the competition for that seat was exceptionally fierce. Coincidentally, there was one secret in that house: Nagumo Yoichi, the youngest, was the most brilliant of them all. His older brothers, who were not as bright as Nagumo but possessed more raw power, tried to suppress him through force. Knowing well that fighting his brothers would only lead to loss, Yoichi had played the fool for the family ever since he learned his first letters, turning himself into a laughingstock.

However, that didn't last forever. There was one person in the house who discovered Nagumo's secret. It was Guest. While cleaning Nagumo's room, Guest accidentally found his secret space and saw his notebook. Inside, everything about Nagumo was recorded, and through it, Guest learned all of his secrets. While she was looking through the notebook, a sudden sound echoed—

Step, step