Juzo Murasaki arrives at a work construction area to take on his new job as a construction worker .  To his quiet dismay , his supervising boss turns out to be Toru Akai , who with his gang had made Juzo's middle school life a living hell .  Akai , however , does n't recognize Juzo .  Juzo's more disconcerted when he discovers that Akai lives with his wife , Nozomi Akai and their toddler son above Juzo's new apartment .  As Juzo emotionally struggles to handle these unexpected developments , a mysterious and seemingly malicious hooded figure appears .  It calls itself Number 13 .  As Juzo attempts to control increasing number of flashbacks and a spiral fall into psychological darkness , Akai constantly picks on Juzo and other work colleagues including Seki Hajime , a former middle school student who becomes Juzo's casual friend in spite of Juzo's anti-social tendencies , at work .  Meanwhile Akai's wife , Nozomi , attempts to make friends with Juzo and entrusting the care of her toddler son to Juzo .  She proudly shows Juzo her husband's school photos .  In one class photo , Juzo's space is marked with an X to show he was absent .  Juzo suffers a severe flashback to explain his absence that day : in their school's science room , Akai and his friends have thrown acid at Juzo's face .  Seki becomes suspicious about Juzo's increasingly odd behavior and goes to inform Arai at the work site , but Arai dismisses him without giving him a chance to speak .  During this incident , Seki does n't realize he's being watched by Number 13 , but as soon as he does , Number 13 kills him . 
Who is Juzo Murasaki's supervisor at his construction job?
Nazomi