June 11th- June 15th, 2025 is Summer – Middle of BOSHU (Grain beards and seeds)-26th KOU “Rotten grass becomes HOTARU (fireflies).”
HOTARU viewing is popular in Japan. Watching them gracefully flying around while glowing allows you to forget the muggy heat of the rainy season for a while.
HOTARU have another Japanese name “rotten grass.” Is there any relationship between them?
HOTARU larvae emerge from the water and become adults in holes dug in the soil. Since they glow even as larvae, people in the past who saw something with glowing crawl out might believe that rotten grass becomes HOTARU. In a sense, it can be said that they had a very high interest in nature.
The rainy season began in SHINSHU Region on the 10th. HOTARU tend to fly around on humid and cloudy days, so it’s the season when HOTARU fly around as the 26th KOU says.
They say that the best time to see HOTARU around NAGANO City is from mid-June to early July, but the weather forecast for next week is calling for many sunny days with temperatures exceeding 30°C.
Then, does that mean today is one of the few remaining chances to see them? It was raining a little, but I decided to go out anyway.
Yes, they were there. Only three, but I was able to see HOTARU glowing gracefully in the rain✌️