Shizukanaru Don, Yakuza Side StoryShizukanaru Don, Yakuza Side Story.

Shizukanaru Don, Yakuza Side Story (Japanese: 静かなるドン, Hepburn: Shizukanaru Don; aka. "The Quiet Don") is a Japanese manga series written and illustrated by Tatsuo Nitta, about a Yakuza boss who works in a lingerie manufacturer during the day. It started serialization in Jitsugyo no Nihon Sha's seinen magazine, Weekly Manga Sunday on November 15, 1988.