As I exit the train into Akita Prefecture, my arrival is announced by the lonely trill of a traditional Japanese flute. Inside the station, a taxidermied Asian black bear greets me. I remember that Akita has the largest bear population in all of Japan. Outside, the mountains are lush with greenery and the sky is an æstival blue.

Today I’m up in the hills of Semboku because I heard a story about a girl, Tatsuko; a beautiful young woman who once glimpsed her own reflection in a mirror-like rock. Fearing her beauty was fleeting, she prayed night after night to Kannon, the goddess of mercy, for eternal youth. One day, she was told her wish would be granted if she simply drank from a sacred spring hidden in the mountains.

Tatsuko found the spring with relative ease, drank from it eagerly, and couldn’t stop. The more she drank, the thirstier she became, until finally she emptied the spring and, in the process, emptied her humanity. She had turned into a dragon. Horrified by her transformation, Tatsuko threw herself into the lake, where she remains as its guardian spirit. I don’t know too much about dragons, but I’m pretty sure they can’t breathe underwater. So sadly, I think whether in human form or dragon form, Tatsuko may have simply drowned.

The tale doesn’t end there though. Tatsuko’s mother apparently searched the hills for days, calling her name until her voice broke. Eventually, in despair, she hurled the burnt remains of her wooden torch into the lake, which, for reasons only folklore and grief can explain, turned into a fish. Specifically, the first black kokanee salmon. Sadly, they became extinct in the 1940s after a hydroelectric plant acidified the lake.

Lake Tazawako is the deepest lake in Japan, which makes it an excellent place to hide a dragon. These days, Japanese trout live here instead of the kokanee salmon, and the waters are thick with them. I’ve never been fishing, but I’m quite confident I could catch one of these with my bare hands. They’re basically queuing at the shoreline.

I check Google Maps to see if there’s anything else nearby, but my GPS insists I’m floating somewhere in the middle of the lake, which feels a little prophetic. I take the hint and wander into the forest instead, all the while being careful to avoid the many bears. Eventually the quiet path leads me to Gozanoishi Shrine.

I stand for a while beneath the torii gate of the shrine, looking out on the lake, looking for any sign of a dragon. The shrine itself is dedicated to Tatsuko and also features a stone statue of her. I wander up the shrine’s steps and pray that her beauty remains.

Back at the station, I find an old Kawai piano and sit playing for a while. A Japanese woman keeps glancing over as I play. I’m either performing surprisingly well on a badly out-of-tune piano, or badly out-of-tune on a perfectly tuned piano.

As I step onto the train, I notice a massive dragon across the tracks. When the train begins to move, I sit staring at my water bottle, trying to translate the label. A wave of panicked horror hits me when I realise it says: “Bottled at source: Lake Tazawako Spring.”

I wonder just how long it will be before I transform into a dragon.