A Meeting in the Desert (Vol. 1 Prologue, 1st Arc)

The 1st Arc of the 'Saint Series' novels.

'Kuro' woke up one day in another world, summoned by a girl who claimed that she's a 'Great Saint'-all because she was bored. Forced to live in an unfamiliar environment, he strove to become as useful as he could be...only to get involved with the lives of the people around him.

Warning: Strong Language, Depictions of Self-Harm, Slow-growth MC