Isekai de Haishin Katsudou wo Shitara Tairyou no Yandere Shinja wo Umidashite Shimatta Ken

Living in Ataraxia, a world of swords and magic, a reincarnated individual decided to make a living out of streaming. Living in a world where such a thing did not exist despite the many forms of entertainment, he quickly made a name for himself. This is not the tale of just a streamer… but of a boy who becomes a legend as a haishinsha. (Source: Novelupdates)