According to the Hero Who Returned from Another World

Daiki Kurosu is just an ordinary high school boy. He worries about his grades and doesn't mind how his little sister likes to mess with him. However, Daiki feels like something is missing in such a normal life. One day, Daiki felt intense palpitations coming from a strange girl on the street. She is a witch from another world, living in hiding...! The long-awaited manga adaptation of the Kakuyomu contest-winning novel "Irinoku" has begun!

(Source: Kadokawa, translated)