InuYasha: Kanketsu-hen

Synopsis

Facing off against a bone-collecting demon, Miroku is poisoned when forced to use his Wind Tunnel, so Sango coats Hiraikotsu in a corrosive poison and uses it to destroy the demon, to which Inuyasha charges in to kill the demon's master. Myoga suggests to have Hiraikotsu repaired by the Master of Potions, seen as a drunken sage. The Master of Potions dissolves Hiraikotsu into a jug of alcohol. Sango jumps into another jug to pacify the demons that were used to create Hiraikotsu. Meanwhile, the Master of Potions talks in secret with Miroku, offering him a medicinal yet poisonous drink that will null any pain from intake of miasma or poison, though it will not actually prevent it from spreading, as it is the price to pay to continue protecting Sango. The demons of Hiraikotsu, angry with Sango but eventually accepting the fact that she would sacrifice herself if it means saving Miroku, allow to fully restore her weapon. However, the Master of Potions explains that Hiraikotsu has changed in some way due to his herbs and poisons.

(Source: Wikipedia)