The Strongest Familiar I Tamed in Another World was a Beautiful Girl Who was my Childhood Friend

Haruto Tsutsui, a plain high school boy, is suddenly summoned to another world with his classmates. While he is being carried away and investigating the abilities of everyone, his estranged childhood friend, Miina Mochizuki, has the ability [Magic Enhancement] that goes out of control. The only way to save Miina is for Haruto to [Tame] her!? Haruto tries to keep his distance from Miina, who is the most beautiful girl in the school, but Miina seems to be different... Meanwhile, classmates who are jealous of Haruto are secretly working behind the scenes...

(from MangaUpdates)