Fatal Error: No Heroes Found

In a world with Gods, Mortals, & Evils, why is it that only heroes are missing from that mix? Or was it always that way? After waking up to realize he is no longer in his working office. Kuro Mikazuki, finds himself in a typical fantasy world as someone completely different, someone named “Caelis Vaelmir” but after almost immediately facing death. There may be more to this world then he originally thought. This world that contains even apostles, why is it that heroes are the only ones that cannot be in this world? Are they there hidden away or are they a concept lost to time.