The story of 12Riven takes place on May 20, 2012 with Renmaru Miyabidou biking his way speedily towards the abandoned Integral building after receiving a message on his cellphone that Myuu, an old friend of his, would die at the building's top level today at noon. When he gets there, he checks his wristwatch and sees that it is 11:24 AM.Elsewhere, Narumi Mishima is on her motorcycle heading towards the same location. She has received a request from a friend and coworker asking her to help save a girl named "Myuu" at Integral. Narumi must save Myuu to prevent the execution of the "Second...

The story of 12Riven takes place on May 20, 2012 with Renmaru Miyabidou biking his way speedily towards the abandoned Integral building after receiving a message on his cellphone that Myuu, an old friend of his, would die at the building's top level today at noon. When he gets there, he checks his wristwatch and sees that it is 11:24 AM.Elsewhere, Narumi Mishima is on her motorcycle heading towards the same location. She has received a request from a friend and coworker asking her to help save a girl named "Myuu" at Integral. Narumi must save Myuu to prevent the execution of the "Second Eclipse Plan". Narumi has never heard of this phrase before, moreover, the message was sent with the "XXX Lv6" marking. This was a rating scale for the severity of a situation and a level 6 marking has never been used. Even a large scale terrorist threat was set at level 5. The message also indicated to Narumi that someone named Renmaru may be there, that he will be on her side...