There's Something Wrong With This Account - Chapter 408 - : 408, [Immortals All Like to Have a Mount]

Mallory is a self-proclaimed queen of laziness who wakes up one day to find herself in a world overrun by zombies. Fortunately, her apartment seems to have a mind of its own—and it’s evolving. From providing unlimited snacks to generating electricity and even sprouting a dimensional elevator, her cozy haven keeps her safe and comfortable while others struggle to survive outside.But when her evolving apartment drags her into alternate realities, Mallory must reluctantly become the “hero” of bizarre worlds, from candy-coated kingdoms to high-tech dystopias. Armed with her magical Staff of Lazula, which lets her achieve greatness with minimal effort, Mallory stumbles into one comedic escapade after another. Whether she's outsmarting sorceresses or surviving talking gummy bears, Mallory proves that you don’t need to be a go-getter to be a hero—just really, really good at being lazy.Join Mallory and her apartment in an adventure that no one expected!

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

In the beginning, when they all thought that she was “he”….

ML #1: We will be brothers for life!

ML #2: This time I’ll reluctantly let you have the #1 seat.

ML #3: I will properly repay royal teacher!

ML #4: Ah Rong is my closest little brother, I trust him.

Afterwards…

MLs: I’m seriously such a fool.

MLs: What do I do, I think I’m gay. I fell in love with my bro/rival/teacher….

Afterwards….

MLs: I’m straight! As straight as steel!

Note:
MC is a girl crossdressing as a boy, she knows how to fight, and naturally possess the gold finger halo from the author.

All the ML(s) is the same person, 1v1, sc, HE

- Description from Novelupdates

This book was inspired by My Hero Academia: Adaptation“Who decided being quirkless means you can't be a hero? Those are just rules made by people who never tried to break them.” When a battle-hardened warrior dies in one world and awakens in the body of a quirkless boy in another, the rules of heroism are about to change.Armed with combat experience from a darker realm and an iron will forged in warfare, he sets his sights on U.A. High School - the pinnacle of hero education. But in a society where superpowers are everything, his approach to strength might just shatter the entire system.Behind a gentle smile lies the mind of a warrior. As he builds his power through unconventional means, one thing becomes clear: rules were meant to be broken, and this world's definition of “hero” is about to be rewritten.Sometimes the strongest ability isn't a quirk at all. It's the will to change everything.