It seems that Ebookjapan's weekly "free volume" releases include one volume from each genre. I'm not sure if it's a coincidence or not that the only ones that seem at all interesting to me are these smutty josei ones. In any case, this series is called "Prison Play Darling." It's a pretty generic story about a girl whose father's business is about to go bankrupt so he takes out a loan from a rich business associate-- with her as collateral. While her parents are working overseas to pay back their loan, she goes to live in the business associate's mansion, where his teenage son (who also happens to be her childhood friend and first love) tells her that if she becomes his girlfriend, he'll knock $1000 off of her parents' loan every time she has sex with him. I assume that the other guy on the cover is his older brother, who appears briefly in this volume but doesn't play any role so far.
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