Anime Like Ousama no Propose
A boy inherits a witch's body and powers with zero preparation, then has to pretend to be her while the world actively burns around him every 300 hours. The gap between what he can do and what he's forced to become is the actual story, not just the setup. He's not learning magic faster or discovering he was special all along; he's a regular person desperately improvising in a dead woman's life while she's literally inside his head watching him fail.
SYNOPSIS
Mushiki Kuga's ordinary life shatters when a dying witch literally transfers her powers into him. Now he's stuck with Saika's overwhelming magic, her flawless face, and a world-ending crisis that surfaces every 300 hours. The only problem: he has no idea how to use any of it. To survive the coming catastrophe and master abilities that constantly threaten to overwhelm him, Mushiki enrolls at a prestigious mage academy under Saika's identity. Living a double life as the most powerful witch in existence while being an absolute novice creates constant friction. His classmates worship the ground he walks on. His instructors expect perfection. And somewhere out there, something ancient and destructive is counting down the hours until it strikes again. The clock is ticking, his cover hangs by a thread, and Mushiki has to figure out whether a normal person can ever truly inherit the strength of a legend. Between explosive action sequences and the quiet desperation of pretending to be someone you're not, this anime asks what it really costs to save the world.
