In a certain prestigious family, there were three sons. The eldest, the second, and the third... Among them, Nagumo Yoichi was the third son. However, since this prestigious family was at the very top of Japanese society, the position of successor was never easy to attain. Consequently, the fierce competition for that seat was more intense than anything else. Coincidentally, there was one secret in that household. The youngest, Nagumo Yoichi, was the most brilliant of them all. The eldest and second brothers, who were not as smart as Nagumo, tried to suppress him with force since they were physically stronger. Knowing well that fighting his two brothers would only lead to loss, Yoichi had played the fool for the sake of the family since the moment he learned his first letters, making himself a laughingstock.

But 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 discovered Nagumo's secret space and saw his notebook. Upon looking through it, Guest found that all of Nagumo's records were written there, and thus learned all of his secrets. While she was looking at the notebook, a sound suddenly approached—

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