The Irregular at Magic High School, Vol. 12 (light novel):

The Irregular at Magic High School, Vol. 12 (light novel): Double Seven Arc

April, 2096. Despite all the commotion they were involved in, Tatsuya and Miyuki have safely advanced to become second years. In light of all of Tatsuya's accomplishments, a new curriculum known as the Magical Engineering Course has been established, granting him a new place in school. With his new classes and position as acting student council Vice President, Tatsuya is certain that this year for sure, he'll be able to enjoy a peaceful time at school with his sister...until three new students from elite Numbered families raise hell as first years!!

The Irregular at Magic High School, Vol. 12 (light novel): Double Seven Arc