The Kakuno appears to be a new pen from Pilot aimed at younger writers, based on the hexagonal body and grip shape, the lack of clip on the cap, the bright colors, and, of course, the smiley-face nib design (which is the cutest).
The grip is described as triangular, but the corners are blunted, so it’s much more of a hexagon, like the traditional orange #2 pencil.
Cap colors: Orange, pink, red, lime, blue, and black
The grip section is translucent grey so you can see the ink filling the fins of the feed - one of my favorite things about demonstrator pens and other pens with clear grips!
The pen comes with a black cartridge, but you can use CON-20 and CON-50 converters if you prefer.
Nib options are F or M, Japanese sized (European EF and F).
My first response was OMGWANT because how adorable and fun is the nib on this thing? and Pilot pens are generally great pens, but the grip section is an automatic no-go for me. I just find them too uncomfortable to use very long. I’m surprised that I’ve kept up with my newish Jinhao X450 as much as I have, with its triangle grip (but then, I mostly hold it at the round ridge just above the nib, since the nib itself is so big).