My Paranoia Saved My Life in the Other World M.P.O.W

On his first real day at school, mysterious symbols show up in Shin Okamoto's classroom. Although he tried to escape, he, along with his entire school, gets transported to an open field. Appearing in front of them is Mariella, a "Grand" Goddess of multiple universes.
Huh?
Since she's too busy to monitor every planet, his entire school was haphazardly summoned to deal with an Evil God that is ravishing one of her planets.

Now he must defeat the Evil God together with his class?

"Hmm...something doesn't seem right about this."

Feeling that something is off, he begins to believe that there is more to the story than what is told. Follow Shin as he uses his strange Title to his advantage as he tries to survive this harsh world while unraveling it's mysteries.