制作現場の木立の横を大井川が流れる。以前の大河の面影はなく、今は水量も少なく穏やかに流れている。しかし暖かくなって大雨や台風の季節になれば、本性むき出しの激流となる。

The Oi River flows beside the grove of trees where the production site is located. There is no trace of the mighty river it once was, and it flows gently with little water. However, when it gets warmer and heavy rains and typhoons come, the river reveals its true nature as a raging torrent.​​​​