The year she turned sixteen, a girl had sex with a stranger that she met on a singles chat line. She doesn't remember much about him except that he was nondescript, and she hasn't been with anyone since. While chatting with a friend, however, she discovers something about the man that leaves her terrified...
Both series are short and deal with awkward routes of love. System of Romance dealing with the main character's realization that she had romantic feelings for a dangerous criminal and Ai Girl being of where the main character realizes she's in love with her teacher. Both deal with the crime of rape and odd impressions such leaves on some women. Someone that likes one or the other surely will enjoy the other.
Both of these are about teenagers who are learning about themselves and their sexual preferences. They both involve sexual scenes and girls trying to find out who they truly love. Fans of one might enojy the other.
Terao Chigusa is timid, overly-apologetic, and is so non-confrontational that she can't even correct others who call her by the wrong name. Terao has a crush on Katou-sempai, works at the library, and especially love the tale of ‘Dear, Mr. Nameless' - a story in which a girl finds a letter addressed to her in a book. One day Terao opens a book, only to find a letter inside just like in her favorite story! Who is Terao's own ‘Mr. Nameless?'
Both series are incredibly short, being one shots, and both deal with awkward romance. System of Romance deals with a girl realizing she had fallen in love with a dangerous felon, and Haikei, Nanashi-sama dealing with a girl sending sweet messages to an anonymous admirer. Both series deal with odd, round-about, but somewhat sweet methods to falling in love.