Kurogane no Mahoutsukai

現代から異世界に転移し、魔法使いとして名を馳せた男、デリス。転移者として類を見ないほど能力値は低いが、とてつもない才を秘めた女子高生、悠那。師弟となった二人が織りなす、最凶の異世界ファンタジー開幕！

A carefree smile on her face, she delivers punishing blows with her fists! The craziest, new heroine from another world makes her entrance

Delice Fahrenheit who’d been transported from another world and has been widely-known for being a prominent wizard, has an apprentice who’d also been transported from another world named Haruna Katsuragi. Her status was unprecedentedly low despite being from another world. However, through her training with Delice, her hidden talents were revealed. The isekai-fantasy, master-apprentice story for revenge(?) begins.