Touru lost his parents at a very young age and had been living with his grandfather ever since.<br />But while his grandfather is recovering from a surgery, he suddenly opens up to his grandson that he will inherit his entire fortune when he dies.<br /><br />Now his relatives who weren't closed with him, started pushing themselves so they can be his guardian.<br /><br />"Organize that family meeting of yours on Saturday the 10th, it might just be your lucky day" said by Tsukitani-sensei his university professor. <br />Touru has no choice but to believe in those words.