Son of Kokabiel

Son of Kokabiel is a Fanfiction story written by Phenex-chan. It tells the story of Hyoudou Issei, the son of the Cadre Fallen Angel Kokabiel and wielder of the Mid-Class Longinus, the Boosted Gear, and two humans, Murayama Kaori and Katase Yui, the other two protagonists and sacred gear holders themselves.

Synopsis
Hyoudou Issei is the half human son of the Cadre Fallen Angel Kokabiel, who he couldn't be anymore unlike. Issei's laid back and generally happy personality is a stark contrast from his father's grim and hateful one. At the beginning of the story, Issei is moved to the town of Kuoh in order to observe the two Devil heiresses controlling the town on the orders of Azazel. For this purpose, he is enrolled into the prestigious Kuoh Academy, where the two heiresses, Rias Gremory and Sona Sitri, are going to school. It is here where he meets Murayama Kaori and Katase Yui.

Murayama Kaori and Katase Yui show Issei the way to the campus before departing for Kendo Practice. Issei is placed into their class and they quickly become friends, maybe more. After the school day ends, the girls say farewell to Issei before reporting to Kendo once again. Issei returns home to learn that his father is moving pieces around in Kuoh, and Yui and Kaori are targets.

While the two girls are leaving school, they're both given leaflets by Kiba Yumi, a devil in service of Rias Gremory. Upon reaching the gate, the two are greeted by Yui's father Eijirō and two "work associates". Their walk home leads the group in the opposite direction, before Eijirō's "work associates", Freed and "Don", kill him. The two murder the girls before leaving the area, both girls making wishes in their dying thoughts. These wishes activate the leaflets given by Kiba, summoning Rias, who reincarnates them as her servants.