Avenger From Another World

An ordinary high schooler Xiao lost his family to an unknown monster in one night. Just as he barely survived the night, he got arrested by the police, charged for the massacre of his family, and was sentenced to death. When all hope seems lost, a crazy looking man told him the origin of the monster, as well as the reason for this senseless tragedy, and for worse, the only way to avoid the death was to escape to the world where the monster came from. Seeing as there's no other option, Xiao gave up his already shattered ordinary life on earth and embarked a new journey to the unknown world...