Shizuka Jiro, often referred to as 'Third', is the main protagonist of the series 'Shizukanaru Don'. He is an ordinary salaryman by day who leads a quiet life, but unbeknownst to his peers, he is also the heir to a powerful yakuza family. Jiro struggles to balance his dual identities, striving to lead a peaceful life while navigating the dangerous world of organized crime. His character is marked by his calm demeanor, sharp intelligence, and the inner conflict between his responsibilities and personal desires.