it's indeed pretty terrible ending, and its pretty ironic when the mc fought his way out over his and his family's fate (in being tokimori's pawn), yet in the end he lost to it..
by far only tokimori's goals has been achieved. damn, he is a blessed culprit..
also what i hate the most is whyd both of chuusinmaru and sumiko had to bear such a cruel fate? T^T
well, though he had failed at fighting fate, at least, the mc has secured his way in achieving one of his dreams to c'est si bon tokine's ass.. sad but gotta give a credit for that one