The Songless Mythical Beast and the Sacrificial Bride

In the village of Isabella, a ritual that has been held since ancient times is held to avoid a bad harvest. It is to dedicate a bride to a phantom beast, and to her surprise, her best friend just before marriage is chosen to play the role of the bride. Isabella, who has not seen her, takes her place and is taken to the cave where the phantom beast lives. Isabella, who faced the phantom beast, asks him to bring fertility to the village with his song...?