[7] The story of 12Riven takes place on May 20, 2012, with high school student Renmaru Miyabidō biking his way speedily towards the abandoned Integral (インテグラル, Integuraru) building after receiving a message on his cellphone that Myū, an old friend of his, would die at the building's top level today at noon.

She has received a request from a friend and coworker asking her to help save a girl named "Myū" at Integral.

Narumi must save Myū to prevent the execution of the "Second Eclipse Plan" (第弐エクリプス計画, Daini Ekuripusu Keikaku).

Both theme songs were included in a CD single that was sold on April 23, 2008,[10] and debuted on Oricon at 144th place.

[11] Chomaru Shikura composed and wrote the lyrics to both tracks and Kōji Ueno handled their arrangements.

For the release on PSP, new opening and ending themes sung by Yui Sakakibara were recorded.

[15] By the end of 2009, the PlayStation Portable version was the 908th best selling video game of the year in Japan, with 4,745 copies sold.

[16] Neal Chandran at RPGFan said that the Infinity series' atmosphere, story, setting, and themes had gotten progressively more sophisticated, dark, and deep with each installment.