It said that this is based on a true story that a person killed people indiscriminately. The story focused on what made him do it.
It seemed that Minoru who eventually killed people indiscriminately had been frustrated at his father.
A case that Minoru did might be a kind of revenge to his father so I felt.
It actually remained me my father a little. A little. I might be like Minoru. I still might be. Everyone.
To be good in any case takes long time but to ruin everything doesn't need time. Just like a moment and sacrifices a lot.
Learn wisdom by the follies of others.
