It happend on 20 March 1995, during rush hour. It killed 13 people, severely injuring 50 (some of whom later died) and causing temporary vision problems for nearly 1,000 others. Its leader, whose name I’m not gonna mention (you can read it if you want), was executed on July 6, 2018 by hanging.
Tbh the way they’ve arranged the actual execution doesn’t sound too bad at all. Quick and painless. The worst part (or best, depending on who you ask) of the capital punishment in Japan is the fact the they never tell the prisoners the date of the execution, so they spend years, even decades in prison waiting for their final day until on the day itself they get know it’s their last one. That’s way more brutal than the hanging imho.