There won't ever be one because the author died last year.
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this novel has 4 vol according to Wikipedia and it is available on amazon
https://www.amazon.in/Kai-Tsurugi/e/B0034Q8SWE?ref=dbs_p_pbk_r00_abau_000000
and 6 according to mangaupdate
where did you read that? I haven't seen any news :o
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RIP
Seriously that’s so sad I really hope they are resting in peace
When is the next update??????
(づ￣ ³￣)づ