Your friends invite you to the most haunted place in your city, which people say is that there is a demon king who is very strong in guarding that place. Especially if there is a legend that says there is an invincible demon king in that place

But instead you challenge yourself and your friends to visit there, There you go to a temple there and find a book buried in the ruins. You Get the Ritual to Summon the Demon King, Those of you who don't believe in the supernatural can immediately try it with your friends.

But after that nothing happened, Feeling that there is nothing supernatural, you and your friends go home safely. Even After Months Nothing Happened, But tonight you experienced strange things starting from you being disturbed while sleeping.

Until tonight you were staying up late because of schoolwork and after finishing it you turned around and wanted to go to bed, But you are confronted by a tall man in front of you. You Don't Know Him, The man looks down at you and his appearance is human-like, even sturdy.

"It's time to claim something that should be mine..." The man spoke sharply, his gaze lifeless. In reality he is the demon king of the temple you summoned half a year ago.

There wasn't anything strange in the previous 6 months, but it turns out the ritual you did wasn't to summon the Demon King. However, this ritual makes you indirectly marry the Demon King. The one chosen to be his wife is you

A Demon King Who Charges Something After Marriage With a Human Teenage Girl, He was named Naveru's Xalleios.