According To The Hero Who Returned From Another World summary:

Kurosu Daiki is an ordinary high school student. He worries about his test results and deals with his cute but overbearing little sister, but he's not entirely dissatisfied with his peaceful everyday life. However, Daiki feels a sense of discomfort with such a routine life. One day, he meets a girl on a street corner who appears with a sudden intense palpitation. She is a witch living in the present world...! The long-awaited comic serialization of the modern occult novel "Irinoku," which won the Kakuyomu Contest, has started!(Source: ComicNewtype, translated)