I think this is a spinoff from a TV series because everybody acted like we already know and love them. I didn't find any of the patrons of this establishment interesting (except Tamae Andô who doesn't get much screen time and doesn't get have any story arc). Ditto the "Master" cook guy. There's annoying plucky guitar and when the Master served up the advice "You need to learn to forgive yourself" I knew I should have punted. (Actually the homeless girl, Mikako Tabe was interesting but she disappears half way through and doesn't return (much).)
A cook opens a restaurant that only serves from midnight till dawn. One day, he discovers an obituary urn. Follow the stories of his regulars tangled astound this urn.