Yoshino, a girl with no family, accidentally summoned a devil from a book she found at an old bookstore. The summoned devil, Belial, proposed a contract whereby if she pays compensation, one wish will be granted. But, Yoshino will have to live with the devil until she dies…

"Your wish can be granted, for the right price." That is the contract offered by the demon Belial.
 
This is a record of the time when Yoshino turned 18 years old, which was not depicted in the main story. The time when he transitioned from being her guardian to being her lover.
 
(Source: Harem, translated)
 
Note: Chapter count includes an epilogue and a bonus chapter.

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