Rising Of The Shield Hero Side Story: Summoned As A Side Effect

The prophecy had stated that four heroes would save the world, and the four heroes had arrived via the summoning.

However, the summoning was not flawless.

A 19 year old male had been summoned into the other world as well, although he was somewhere else instead of the king's castle, having nothing but his clothes, a gray katana with a chain connected at the hilt, a Naginata strapped to his back, a traditional, yet magical longbow at his left hand, and his bag full of notes at the other.

It was at this time, that the prophecy also changed, as the flaw of the summoning was noticed, and the prophecy had stated that the one summoned due to the flaw of the summon will be a hindrance to the heroes.

What would happen to the male?