A Spy at U.A. High: My Days [Crossover]

[Poltz Part 3: The Days I Spent as a Time-Retrograde Army Soldier at Honmaru [Crossover]. Poltz is still the protagonist. There is no content featuring Hideo Wugai. You can find it under "Currently Writing" on my profile.]

A transfer student arrives at Oridera Middle School. On his very first day, he beats up every delinquent and street thug in the area. His fearsome reputation leaves the whole school trembling, yet he somehow gets straight A's.

Tasked by the BOSS with becoming a spy among the heroes, Poltz becomes a middle school student who wants to be a hero.

The transfer student, who'd actually rather fight and cause trouble: Pretending to be a good guy is so hard.

As he keeps up the act, Poltz realizes that everyone around him, from teachers and classmates to those so-called heroes, thinks he's a wonderful person who's just too proud to admit it, all aloof and taciturn.

Poltz, struggling not to wreck everything and getting mistaken for a tsundere: ...

As long as you're happy :)

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Poltz Part 3: The Days I Spent as a Time-Retrograde Army Soldier at Honmaru [Crossover]

Blurb:

Poltz is a gem person who transmigrated from tens of thousands of years in the future. Entrusted with the mission of changing history, he crossed the wrong timeline and, by a twist of fate, became a Saniwa working for the Time Government.

The good news: The Time Government has the technology to travel through time.

The bad news: The Time Government exists to keep history from being changed. He should be on the time-retrograde army's side.

Since ordinary Tsukumogami can't help him, perhaps corrupted ones can.

.

So Poltz volunteers to take over a corrupted Honmaru where six Saniwa have died.

When the corrupted Tsukumogami come at him with swords, Poltz gets straight to the point:

"My mission is to change history!"

The Tsukumogami: ???

#We're corrupted, but we don't want to be time-retrograde soldiers!#

You useless Time Government, why did you let the enemy in???

.

A post quietly goes hot on the Saniwa forum.

[Topic: Have you heard? A time-retrograde soldier has infiltrated the Saniwa and changed the histories of two worlds!]

Saniwa flock to the thread, leaving impassioned comments.

[The Time Government is useless. How could they not figure this out?!]

[If history changes, could we disappear?]

[Disgusting! How could there be such scum among humans?!]

[One person can't change the past. Relax.]

But gradually, people realize something is wrong.

[Help, there seem to be fewer time-retrograde soldiers. Is that true?]

[Who said that Saniwa was a time-retrograde soldier? He's a savior!]

[If it weren't for this colleague, the world would have been destroyed ten thousand times over!]

[How did he fight the will of the world all by himself?]

.

What Poltz changed was the future in which humanity was doomed to perish.

Before reading:

1. The protagonist is one of the characters from Land of the Lustrous. He is a gem and only has a human form, so he has no gender. However, characters in the original refer to him as "big brother" or "little brother," so I use "he."

2. The protagonist has no gender, so dressing in men's or women's clothes, wearing very short shorts, or having long hair are all perfectly normal!

Theme: