2001 saw many things including the further growth of Gen. 4 which entered the group in 2000, and with that also came their debut in Momusu calendar land in the 2001 release. Momusu's 2000 calendar can be seen here.
January & February features H!P's most symbolic mentor Yukosan beside then new member Rikachan as the strong feeling of winter is seen in both their clothing as well as the coloring of the background.
Keisan's yellow outfit blends in with the "painted" yellow background showing the brightness that springtime brings for the months March & April and I really love the arm locked pose that Gomaki is showing here with Keisan . ^-^
Like January & February, May & June also features a "mentor" like pose as Nacchi is paired with a very young Aibon. Also note how each page's "painted" background was colored to match one of the member's outfits.
Blue just seems to suit the summertime and July & August sports a swirling background of shades of blue & white complimenting both Yossi's and Marippe's casual outfits here.
The shades of brown here represent the feeling of fall and another great mentoring pose can be seen here between Kaorin & Nono.
November & December sports the soft red that Christmastime brings each year and while the previous year's calendar featured numerous group shots, the 2001 release saves it for just the final page of the year. I can't help but mention how much the image of November & December reminds me of Momusu's appearance on the cover of Playboy which were posted here on VOX back in early January of 2007.