Ousama no Propose  

King Propose, Kings Proposal, 王様のプロポーズ, Ousama no Proposal, King's Proposal, สาบานรักราชันจอมเวท

Saika Kuozaki is known for her stunning appearance and holds the title of the most powerful mage in existence. She has the ability to prevent the end of the world every three hundred hours, but when she gets mortally wounded, she passes on both her powers and body to Mushiki Kuga, a normal high school boy who stumbles upon her. Although Mushiki inherits her abilities, he lacks control over them. To save the world, he must attend an academy for mages as Saika while keeping his true identity concealed.