They answered more questions in second volume about Kolder,which also is worth reading.All next volumes are more or less worthless.Pity.Yeah, I really did not see:
The Kolder being an entire race of high-tech Sliders/Isekai coming. I quite admire a good plot twist that both surprises me and is something that fits the existing themes of the story so I was impressed with this one.
One of cases,in which story should not be continued,but was.