Lake of the Evil Water God

In this one Sango is a part of the gang & while they are off looking for Naraku's castle they see a strange procession. It turns out that in the nearby village, the villagers have been forced by the local Water God to sacrifice their children to him. It's now the headmaster's turn to sacrifice his child. The gang is puzzled by his reaction when Inu says it's really a demon with a shard up to no good & he wants to go on with it anyways. Anywyas it turns out it's not really his son he's sacrificing as his son has hired the gang to help his friend. The child the headmaster is sacrificing instead. It turns out that Inun was right it was a demon with a shard & he spends most of the epi battling it. Near the end of the Epi, Sango & Miroku find the real water God or Goddess. They bring her back to the battle. She needs her halberd from the false god in order to regain her size & powers. She gets it back & the false god gets destroyed. & everyone's happy!