10 years after the ending of the original, comes the sequel to the manga series Muhyo to Rouji no Mahouritsu Soudan Jimusho. Muhyo to Roji no Mahouritsu Soudan Jimusho: Mazoku Magushi-hen, follows Muhyo, Rouji and all their friends some time after the conclusion of the main series. ---Magical Law (Mahouritsu)... its purpose is to punish spirits who have harmed human beings or have committed wrongdoings. Muhyo, who is a genius practitioner of Magic Law and the youngest Executor ever, and Jiro Kusano (Roji), Muhyo's crybaby assistant who hardly ever supports him, investigate mysterious blackouts and spiritual phenomena that have been occurring in the city frequently. Moreover, those blackouts involve a person called the "demon magician," who creates forbidden tools.As they investigate further an ominous shadow approaches the two...!?After solving numerous cases and mysteries in the past, will Muhyo and Roji succeed again?