Nambu Brewery Hanagaki "Blend" Aged Sake

This was poured at the tiny upscale Kanazawagin restaurant in Kanazawa. It is quite dark golden amber, a blend of a bunch of aged sakes, very dry and umami, but this one wasn't doing it for me. A bit too bitter and umami, almost rustic. I question this "blend". Maybe I just need something smoother for the end of the night. Junmai Koshu