The Hero From Another World was overpowered, moving faster and with more strength than anyone in the world, in ways that trivialized combat with enemies... but that doesn't mean he understood how to navigate a foreign culture, much less change the systems within in it he disapproved of.
After gaining the enmity of his former ally Lady Wren, he complains to his rather dumb but kind slave girl Sasha that he'd like to switch places with her and live her comparatively easy life. To his surprise, she does just that-- and it turns out she's not as dumb or as kind as the former Hero thought.
Despite her betrayal and intermittent cruelty, the former Hero becomes convinced to work with her to end slavery as a whole, and becomes enmeshed with a power struggle that lies beneath the surface of the kingdom... even as they struggle with their own identity in their new body and role.
----
Cover image created with Picrew’s “五百式立ち絵メーカー“!! https://picrew.me/share?cd=CSbCyez3YZ