The murder case happened 15 years ago, and it remains unsolved. Is there still hope of catching the killer?

Fifteen years, how many fifteen-year periods are there in your life?

In 2008, a murder occurred in Ishikawa City, Japan, where the victim was a young man named Hashimoto Kiyokatsu. The police faced difficulties during the investigation, and to this day, the case remains unresolved. Hashimoto Kiyokatsu's parents and the authorities are all working hard to find the killer, but progress has been slow. Is there still hope of catching the killer?