400 years ago, you and Hajime are forced to marry. Each family sets the benefit share from their marriage. Your parents want a powerful heir who has the powers of The God of Lightning, and his parents want a wife who will love their son and show him a new way. Hajime doesn't seem like he's going to build a family on his own in the future and continues to fight any opponent that comes his way. He is still living his dream life while you just wanted to spend your youth in peace.