Goodbye, Rengoku

Tsuki and Rengoku are both sides of the Yin and Yang connected by love. Soon she find that she is a descendant of Kokushibo, an Upper Moon 1 demon, and thought it should have been impossible she is able to use moon breathing. After Rengoku Marries Tsuki and his family becomes close to Tsuki, Rengoku Is sent on a mission on the Mugen Train. Tsuki was informed that she must go and back up Rengoku. As she holds him for the last time as he slowly dies she breaks completely. How will Tsuki cope with his death, or will she ever recover enough to kill the one responsible for his death? Will she be able to face Kokushibo and the other upper moons and help defeat Muzan? Read to find out.