A Guide for Background Characters to Survive in a Manga - Chapter 61

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

After being transported to this world, Nara Kazuki discovered that as long as he grinded enough proficiency, his jutsu could level up.And so, he began walking a very... peculiar ninja path.

A muffled murmur sounded softly,

Crazy goblins ravage the village,

Mutated beasts roam the fields,

The ancient old gods are gradually awakening,

Just when the darkness is about to engulf the entire continent,

A brave man from another world quietly appeared,

This may be the darkest hour before dawn.

Human: “The savior has come?”

Monster: “Have new food arrived?”

Till the fame of the brave spread far and wide,

Walking through every corner of the continent,

He/she/they know,

What is the real darkest hour.

The monsters and humans said in unison:

“I beg you to be human, the ancient gods were so scared that they went back to sleep.”

- Description from novelbuddy

Do you know how long will you live?

Are you sure when you wake up the next morning, you will continue your life just like any other day?

What if the world wanted to flip your life upside down?

What will you do? What can you do?

This is what happened to Shin. who took his life for granted and was taught a lesson when the world flipped upside down.

Many strange phenomena were occurring. People started gaining abilities and evolving. Many different threats to humanity started appearing. The world was changing. So many myths and things became real which was supposed to be fiction.

Shin also had to adapt to this new world. Shin struggled. to survive, to live another day, to have his daily peaceful life back.

Amidst this Apocalypse, Shin Awakened his ability.

[Plunder]