One possible horror on the last train home could be encountering a strange and menacing figure. Maybe it's a shadowy person who just stares at you without blinking, making the hairs on the back of your neck stand up. You feel trapped in that small space with them, and there's no way to escape until the next stop.
My scariest last train home experience was when the train was almost empty. I was dozing off when I heard a loud bang. I woke up and saw that the door at the end of the carriage was swinging open and closed on its own. I thought there might be a strong wind outside, but when I looked out of the window, it was completely still. I walked over to close the door, and as I did, I felt a cold draft on my neck, like there was something right behind me. I quickly ran back to my seat and didn't move until the train reached my stop.
The JJBA manga is indeed finished. It had a great journey and wrapped up with a satisfying conclusion for fans. However, there's always the possibility of spin-offs or related works in the future.
I don't know who the author of 'the last train novel' is. There are so many novels out there and without more specific information, it's hard to determine the author.