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The title Izakaya ("居酒屋") which I check is a reference to a type of Japanese drinking establishment or quite simply using google translation, The Pub, sung by enka singers, Nana Kinomi and Hiroshi Itsuki. Here Masha did a duet with a singer named Aiko at her show, All Night Nippon's sing! aiko back then in year 2000. Very blue-sy, I sorta wish Masha will explore more of this genre as his voice is perfect for it. By the way after reading the lyrics, sounds like Masha kind of song!
The original version and the lyrics after Read More link.