Chrono x Sex x Complex (3)

is the third volume of the Chrono x Sex x Complex light novel series, written by Yukako Kabei and Illustrated by Yuichi Murakami. It was released under the Dengeki Bunko Imprint in November 2010.

Synopsis
Mimura, who has returned to modern Japan, has a feeling of strangeness, and finally meets Mimura S. Oldman, who has Mimura's body. And the fact that I found out is that my hometown is very different from what Mimura knows, and my childhood friend Komachi has disappeared. Olympia uses a new time magic for Mimura, who is depressed and returns to the school. Thanks to that, a big panic that occurs in the school. And Mimura learns the horrifying consequences of time alterations and the meaning of the librarian's words, "Don't forget Komachi." What is the identity of the librarian?

(Source: Amazon JP - Translated)