Chiyu Mahou no Machigatta Tsukaikata: Senjou o Kakeru Kaifuku Youin

Usato, an ordinary high schooler, happens to run into two fellow students after school one rainy day. Suddenly, all three of them are engulfed in a magic circle and transported to a fantasy world. There's just one tiny problem — Usato is simply dragged along by accident! On top of that, Usato learns that he is capable of using healing magic — an incredibly rare affinity in this new world. Now Usato must spend his days with the rescue team thugs, struggling through their hellish training regimen — learning the wrong way to use healing magic.