Oosaki Airu

Although Eugene was blessed with an extraordinary talent for defensive magic, he had no talent for offensive magic. He is ridiculed as incompetent by those around him and enrolls in a magic academy to escape. However, his "useless" defensive magic came in handy there, and as expected, he was assigned to take care of the beautiful Demon King Erinyes, who once ruled the world...!?Official English Light Novel

After his class gets buried alive on their way back from a school trip, 18 year old Makoto Takatsuki and class get transported to another world. Unlike the rest of his classmates who gained powerful abilities, Makoto barely gains any power. "This other world is unbalanced!" With the threat of a great Demon Lord rising again and a goddess with zero followers, can Makoto make his way through this new world and clear the isekai!?