During our visit in Hagi, we also spent some minutes at Yukawa Family Resident, now it's kind of museum. It's a samurai-mansion style architecture.
It has an old style yet high technique utility to take river water into the mansion, called Hatoba. This type of water utilization is typical in the households along Aiba river.
The Aiba river itself, in front of the house, has very clear water. There many Koi fishes can be seen swimming around freely. It's public place, but no one take it. Hmmm I can't imagine what happened to those fish if they're swimming in Indonesian's river? =))
Koi fishes along Aiba river