Mercenary adventurer Theo Aspel is tragically weak, leaving him no choice but to repeatedly joins various parties—only to get kicked out. In order to get stronger, he succeeds at summoning a demon that will grant him a wish. But the minute he sees her, his wish to get stronger flies straight out the window. 
This devil, who hadn’t been summoned in many years declares: "I will grant your wish, but you must give me something precious to you."
Theo stutters out a reply: “W—will you marry me?”
The devil is stunned to say the least, but grants his wish, making them husband and wife.
They embark on a happy married life together, causing quite a stir around them along the way. This is a story of a boy and a girl that's a just a tiny smidge dirty.

Theo Asper is a member of the mercenary guild, who has already joined and been expelled from several adventurer parties.
The reason is simple, he is too weak.
Wanting to become stronger, Theo summons a demon to make his wish come true. But the moment he laid eyes on the demon he summoned… the dreams of becoming stronger left his mind.
 
“I will grant you your wish, but in return I will take something important…”
 
“Please m-marry me!”
 
“…Ah?”
 
The demon granted his wish, and they became husband and wife.
 
“Helvi… Can we hold hands?”
 
“…Uh, sure. (You’re so cute! Ah… I want to ravish you right here and now. Just wait until we get home…)”
 
This is a slightly lewd (?) story of a timid boy and an assertive demon lady marrying and living happily, even as there she causes a great deal of fuss around them.

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