Sagami and our heroine, Yuki, are two members of the manga club that share a passion for manga. They end up dating and, eventually, have sex in the club room. Unfortunately for them, another member of the club captures their indiscretion on video.

After he shows the video to Yuki and points out all the bad things that will happen if he leaks the video, all the ingredients for a NTR story are assembled.

(Source: FAKKU)

[Note: This has 2 near-identical versions, one is the original doujinshi, the hardcore version which is a single book that has black bar censorship; the other is a heavily censored softcore version, published by Night Comic; The covers are slightly different but the story is the same.]