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Lynkaster: Actually that's not true.
The thing is, the series is
divided into arcs which approximately cover the events until the year end (other world calendar wise).
And each arc is actually named differently in the Web Novel (except the initial "Genjitsu Shugi Yuusha no" part).
What the Author initially wanted was to follow his Web Novel pattern and end "Genjitsu Shugi Yuusha no Oukoku Saikenki"
arc at LN v04, and then start the
next arc (which cover the content from LN v05 to v10), under a different name.
But his publishers and editor didn't want him to do that and voted against it, as the series was sort of still fresh at around LN v04 and could have impacted its sales.
Also, LN v04 actually marked the point of story which Author wanted to cover, atleast in the chance that the series got axed for some reason, since it also served as a good breaking point.