Kyoukai Senjou no Horizon - Volume 6A, Prologue: Rest Area Fighter

Wen Xuan, the chief disciple of Shui Yunzong, respected the teacher halfway and loved his fellow students, was a model among his disciples.
    He had thought he would spend his life like this.
    Until one day, he met an open younger brother.
    His brother told him that this world is actually a text.
    And he, as the ugliest and humble negative character in the text of the upgrading and upgrading, will be bumpy in the second half of life, departed from relatives, and desolate.
    .
    “Too many people have talked about your life in scornful sarcasm after tea. No one knows how you spent those years and no one sees how you hold onto the bottom line in the lonely struggle. No one cares about the suffering you have experienced and your persistence. But I have seen it and I know that I care. ”

    “So I came to this world and became your dependency.”

- Description from Fpzw

I, an ordinary high school student, Kimizuka Kimihiko, who easily gets involved in things, was appointed to take care of mysterious attache cases by mysterious men in black suits. After meeting a beautiful angel-like detective girl, named Siesta in a hijacked plane, I became her assistant.

And from there–

[You deal with the beehive, and I’ll restrain the enemy.] [Don’t make plans that make me the victim.]

We had those kinds of foolish conversations, all while being completely broke every day and fought against . Even when there were hurricanes, the weather-beaten duo sleep past it. Sometimes when we saved money at a casino, we would jump around on the beds at a resort hotel, only to be broke again the next day. We would walk through deserts, traverse through jungles, conquer mountains, cross oceans– The great detective and her assistant would go through these dazzling adventures–

Until she died.

And this story starts from 1 year after that incident.

I’m the only one who’s left, but I carry on her remained wishes.

This story is far from over..

Sue Kirin was a loser. Thirty years old with no hope for advancement at his job and no redeeming features except one, Magic. For as long as he could remember Kirin had dedicated his life to practicing the Arcane. Unfortunately, when he was passing down his knowledge to his niece, she lost control of her power resulting in a backlash of vicious energy that resulted in her being sent to the hospital, her life in critical danger.

In the tenth year after the new era, the world finally came to an end. Zhang Mu truefully waited for his death, but unexpectedly found that he had returned to ten years ago. With his memory about the future, he swore that he would change the calamitous history, saving the earth from being destroyed! Walking dead, zergs, evolvers, and various mutated animals… nothing can stop him! The first step is to retrieve his identity as an era merchant , then find all the treasures he can remember to enhance himself!

- Description from Novelupdates