A leader stands upon the ground of the rice paddy. She is searching for treasure. It is said that this treasure here in this rice field will make things much easier for the leader (that's what leaders really want, after all). If she gets this treasure, it will be a great convenience for her, because convenience is everything when you're the leader.
She finds a place to dig in the ground. It looks like there's some fresh dirt here. Finally, the treasure of convenience that will make this leader's life so much easier. She digs into the ground and pulls out a box. When she opens it, she finds out it's a bento (べん). My god, she thinks. This really will make my life more convenient. My people can take their lunches with them now instead of coming back to base to eat, which will waste way less time!