Kono Kanojo wa Fiction desu.

Lead character is a naive boy who's fallen in love with an older girl who everyone considers a genius writer. He's so in love in fact, that he has forgotten about his secret hobby for the last two months. His secret hobby is that for the past ten years he has been writing the "character profile" of a single girl. Her birthdate, personality, hobbies, conversations, etc… are all recorded in a large pile of notebooks. All this time, this fictional girl has been his friend and lover, but now that he is in love with a real girl, he decided to throw them all away. In order to "purify" the notebooks, he decided to burn them at a nearby shrine. To his surprise, the senpai he's in love with was also there. It starts to rain and as they talk the girl confesses she's having trouble writing her novel due to inexperience. As the storm gets even stronger, the lead character believes that since she confessed her "weakness" to him it is ok for him to show her his own "secret". Filled with courage, the boy opens the bag where he brought all the notebooks… except that instead of notebooks, the bag now contains the girl (naked of course) he's been creating for the past ten years!!

Mayama Haruki and Himemiya Tsukiko have been childhood friends and neighbors for as long as they can remember, but after a girls-only meeting in fourth grade, Himemiya distanced herself from Mayama. Now in their 2nd year of middle school, Mayama has become an ero-freak who specializes in harassing Himemiya. Determined to unravel the greatest secret of girls, what happens on "that day", Mayama follows Himemiya and uncovers…!

In a world driven by fictionalized friendship, courtesy of the program named "real account", the table suddenly turns, and the cybernetic world turns real! how will they survive?