Mr. TONEGAWA Middle Management Blues Season 1 Episode 21 Defamation ( Air Date 2018-11-28 ) Genre Animation, Comedy, Drama category. Overview "Overseeing the Teiai corporate Twitter exposes Tonegawa to an account that seems to exist solely to hate on his company, triggering the middle manager's combative instincts. Meanwhile, Ootsuki's underground gambling games hit a snag when a rival foreman begins running his own entertainment scheme.".