Boku no Sekai wo Mamoru Hito 2

is the second volume of the Boku no Sekai wo Mamoru Hito light novel series, written by Nagaru Tanigawa and Illustrated by Akifumi Orizawa. It was released under the Dengeki Bunko Imprint in June 2006.

Synopsis
Tatsumi Asanagi, a high school student, lives with Ayaba Tsumugi, a girl who unilaterally protects him, and Neko, a weapon girl. And that everyday is always full of danger! A girl using a Western sword makes a fuss, and mysterious Gothic Lolita magicians attempt to kill Tatsumi! Furthermore, even three childhood friends came to-- !?

(source: Bookwalker JP - Translated)