Three weeks after the first series of incidents concerning Mu, life has settled down for Kazuki Arata. Along with his new friend, he has eased into a new life as an Awakener, special people with access to the other dimension and Armaments, weapons manifested from the soul. Meanwhile, Miki Amagi finds herself in front of emotional crossroads. With a class trip to Tenka Peak looming over the horizon for the students of Fuyusato Academy, she tries to come to terms with her feelings for both her childhood friend and the transfer student. A new threat looms in the shadows, and along with it lies more answers to Mu and Nullities. It is a school trip to remember for Kazuki and the group! Highest rank: #25 in Japan-based

With late July comes the highly-anticipated annual school event, the Fuyusato Grand Festival. Having put the incident at the Chronodome behind them, the main trio look ahead to this event. In the midst of the preparations for the festival and sports extravaganza, Kazuki runs into an uncharacteristically worried Akane Fujiwara in the library with a surprising question for him. A request, coming out of the left field, sets him on a collision course with his past and his enmity with Reijy Ishida. Meanwhile, Guren Izaya sets forth the next step of his plans, approaching the troubled heir to the Ishida Conglomerate with an offer. Lines are drawn, and some of Mu's secrets unravel in the fourth volume of Fractal Plane.

After painful confessions and reconciliation, Kazuki Arata and Sayaka Uehara welcomed a new addition to the team. However, things would get complicated for Kazuki due to the appearance of a temporary transfer student. This time, in the form of Yui Kimura, the idol rising through the ranks, who will be having her first solo show in a week's time. Being classmates with the hottest idol in town is no easy task, especially one as cheeky and upfront as Kimura. However, beyond the glamor and the fanfare of stardom lies a complicated web of feelings that no one is aware of. This idol is more than meets the eye, and she holds a secret that will forever change Kazuki and friends' understanding of the world of Nullities.

Mu, the world that exists parallel to our own. It is a world that harbors shadowy manifestations of people's feelings called Nullities. One day, Fragments, dimensions that connect Mu to the real world, begin manifesting in Shiroki City. With that comes disappearances of people who never return. Kazuki Arata, like most people, dismisses the explanations for those disappearances as urban legends. However, with the appearance of the transfer student Sayaka Uehara and his unexpected trip to a Fragment, the wheels of fate begin to turn on this new chapter of his life. Highest rank - #40 in Lightnovel