Weren't light novels in general meant to be targeting boys 12-16?
It is essentially equivalent to those cheap paper-back fantasy novels that have either death, ritual, cult, sword, blood, sacrifice, temple, hero, warrior, crystal, final or dark in titles...
You know, those that you can find near the cashier in most bookstores for equivalent of less than 5$ and have so generic story that after reading 2 you've read virtually all of them...