Haruto, along with Sengoku, Ukawa, and the other members of the first Phantom Triggers go to visit the grave of their old friend, and the memories of the life of Aoi - a young woman so vicious, and yet so pure - return once more. What events led to Aoi's final moments?
A competent and fun VN, really showing off the strengths of the series with its character writing, and still suffering the flaws of the Phantom Trigger series in wanting to be ero yet settling for tame ecchi. (once again, Inohara and Reni's strange sisterhood is wasted on ecchi shots, and Aoi Aoi would've been fun 'teaching' Haruto)
Its a nice change...
All I can say is just read from this volume if you want to know Phantom Trigger