A bottle of Yu-ker

Yu-ker (Yu-keru) is a health tonic containing various herbs and caffeine.[1] It is Yukio Okumura's supplement of choice to cope with his stressful life.


  • Yu-ker is a parody of the real life tonic Yunker.


  1. Salaryman Exorcist: The Sorrows of Yukio Okumura:Chapter 1, page 2

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