Summary: Both seme and uke are siblings and was badly treated by their parents. The father favored the younger brother (seme) more then uke. The day of seme's marriage, uke tried to save his brother's wife from drinking a poisoned drink and died. Seme asked a shaman (?) to bring him back to life cuz he can't live without him. Uke stays alive by drinking seme's blood every now and then.
THANK GOD FOR THE HAPPY ENDING
Shikabane to Hanayome