no, it’s nothing related to 500 days of summer.
this is an interesting project from felissimo, once your subscribe to collect these colored pencil for 2,400 yen per month (~860 baht / price is depending on where you live in the world), you will receive 25 colored pencils each month delivered directly from japan packaged in like tones and hues. the collection gradually takes shape as each colored pencil set arrives, expanding over 20 months to grab all 500 colored pencils!
p.s. they have name for each and every color, ain’t that awesome?