A Certain Magical Index NT, Vol. 2 (light novel) — Kazuma Kamachi

As the dust settles from their encounter with the Freshman, Touma Kamijou, Shiage Hamazura, and Accelerator finally cross paths in Academy City. It won't be long before these three find themselves with yet another challenge on their hands -- explaining what the heck they've been doing to everyone who was worried about them! The boys have survived more than one scrape with death but it's anyone's guess if they'll live through this...