One of the Substories you encounter in Onomichi asks for a specific item set, a Bento Lunch Set. This guide will tell you Where To Find Bento In Yakuza 6: The Song Of Life so that you can buy the item and complete the Substory.
The real confusion with this item is that you receive the Substory in Onomichi. It asks you to find a Katsu Bento, which is basically any Bento lunch set. Sadly however, Onomichi does not have any vendors that sell these items. You cannot buy it in Onomichi and none of the enemies drop it. To complete this Substory you need to progress through the game until you return to the other city. Here you can buy a Bento Lunch Set in Poppo on Tenkaichi Street.
Once you’ve bought the item there you can keep it on your person until you return to Onomichi.
in Yakuza 6: The Song Of Life Guides