I suggest you go read the few translated chapters of these series. It basically follows a blackmail scenario, with Shiori, the main heroine, being raped ad nauseam, with the dude in glasses being the main antagonist who started it all. Pretty basic, but if you're into the genre, such a myself, this is a gem of a series.
The author also started remaking some of the earlier chapters, which were originally made back in 1995.
wooo,finally, 21....I fucking love you pop9............ I still remember, the 1st time when I watch this series, It was the year 2001. Now almost 1 and half decade passed,finally this series come to the end. Thank you pop 9 again...