SO like thats not Kou. Also, the picture only had one kid. Either Hanako did die (since Tsukasa didnt ask the god to extend his life) and Tsukasa lived in place of Amane, ooooooor Tsukasa was killed, and Amane is now trying to get his brother back (just as Tsukasa sacrificed himself to the god to extend his brothers life)
SO like thats not Kou. Also, the picture only had one kid. Either Hanako did die (since Tsukasa didnt ask the god to extend his life) and Tsukasa lived in place of Amane, ooooooor Tsukasa was killed, and Amane is now trying to get his brother back (just as Tsukasa sacrificed himself to the god to extend his brothers life)