Wrong Way to Use Healing Magic

High school nobody Usato was just waiting for the rain to stop after someone took his umbrella when he unexpectedly meets two of his school's most popular students. Happily, they're both really nice, and Usato quickly feels like they're all on their way to becoming good friends. Unhappily, the two of them get summoned to another world, and he's pulled along with them. Kazuki and Suzune are of course the heroes the kingdom was looking for, but Usato's far from useless – he turns out to have the rarest of all powers, healing magic. He'll be really helpful in fighting off the demons…assuming that the training doesn't kill him first.