These secateurs follow a very familiar format to other Japanese secateurs, and that's a good thing as its a tried and tested design.
"Mainichi" means "everyday" in Japanese.
The handles are asymmetrical making them comfortable in the hand. The blade is also off centre - similar in design to a sidebent scissor. The handles themselves are forged separately to the blade and then riveted in place. This makes them robust but also isolates some of the feedback from the cutting process.
The yellow plastic covers are more about visibility when you put them down rather than grip and can be cut off if you prefer.