異世界でテイムした最強の使い魔は、幼馴染の美少女でした

平凡な男子高校生・筒井春人は、突然クラスメイトとともに異世界に召喚される。Haruto Tsutsui, a simple high school boy, is suddenly summoned to another world with his classmates. As he investigates everyone's abilities, Haruto's estranged childhood friend, Miina Mochizuki's "magic enhancement" ability goes out of control. The only way to save Miina is for Haruto to "time" her! Haruto tries to keep his distance from Miina, the most beautiful girl in the school, but Miina seems to be different... Meanwhile, Haruto's classmates, who are jealous of him, are playing a dark role...?