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An 18-year-old girl who lost her family in an accident, Yamano Mitsuwa falls off a cliff one day and transferred to a different world with a civilization level of medieval Europe. Mitsuwa who discovered it was possible to go and return to Earth after a deadly fight with wolves decided to live in both worlds.

「For security in old age, I will aim for 80,000 gold coins!」

he manga centers around a certain boy who lives alone away from people, but harbors a special dream. One day, he meets a lone girl, and the story begins as he becomes part of the girl's destiny.

Ukei Kaito fought a desperate struggle in order to fulfill his role as a summoned hero. He defeated the Demon Lord and saved the very world, only to meet an end filled but with betrayal. The companions that he’d trusted throughout his journey betrayed him and killed him by sticking a blade through his chest.

It was then that he swore to himself.

He swore that, if given another chance, he would no longer so rigidly cling to the concept of “faith.”

He swore that, if given another chance, he would dedicate himself to enacting the most atrocious act of revenge possible.

Rokudou is a loser, and everyone knows it. He gets picked on at school, gets snide looks from passersby, and can only muster up the courage to complain in secret with his equally hapless friends. Looking to turn his life around, he desperately uses an ancestral artifact passed down in his family for generations: a scroll that is capable of subduing all demons. However, in the modern age, it has a different effect: it makes all bad girls fall in love with him.

One day 's lunch break, suddenly a male high school student Yuzo Ogata who has been transferred to another world of sword and magic together with four other friends.
According to the Princess of Space-Time Magician, a foreign world who summoned them, they want them to beat the Demon Lord as Heroes to save this world.
Suddenly I was surprised at four friends "Temple", but it was a relaxing expression ... ... where the princess told of a startling fact!
"`?? There should only be four braves though?"
"A man who was mistakenly summoned to a different world"

Kazura was selected as the winner on a lottery that he bought on a whim, and received 4,000,000,000 (billion) yen.

To evade the hyenas that smelled the scent of his money, Kazura took refuge at an old residence that had been handed down from generation to generation in his family.

When Kazura was investigating the place that would become his shelter, he stumbled on a certain room where it was possible to go into and back from another world.

Now, in the world of frozen wastelands war of destiny that transcends time and space befalls upon heroes.

Long ago, the God Aigis sealed away the devils that caused havoc in the human realm. Now many thousands of years later the Demon God, Tiamat, has come to the human world seeking to destroy all humans using the very devils that Aigis had sealed away so long ago. One of the first to fall was the imperial capital where their prince, who is descended from heroes, had no choice but to run away and watch as his homeland burned. Now he must do what he can to survive Tiamat's onslaught and recruit allies in order to take back his kingdom.

A young girl fights on the frontlines in war. She has blonde hair, blue eyes, and nearly transparent white skin, and she flies through the air and mercilessly strikes down her opponents. Her name is Tanya Degurechov, and she speaks with a young girl's lisp and commands the army. Tanya used to be one of Japan's elite office workers, but because of a wrathful god, was reborn as a little girl. Tanya prioritizes optimization and career advancement above all, and she will become the most dangerous entity among the Imperial Army's sorcerers.

Gabimaru the Empty, a former ninja assassin known feared as a heartless husk of a man, spends his days on death row wondering when an executioner skilled enough to so much as harm him will arrive, as he thinks nothing of seeing an end to his meaningless existence... Or so he thought. Then the lady executioner, Asaemon the Beheader, rekindles his hope with an astounding proposition. If he ever wishes to see his beloved wife again, he is, under the auspices of the shogunate, to embark on a perilous voyage to the mysterious mystic island said to house the elixir of immortality.