Ichijiku means fig in Japanese, and although the origin of the term is not 100% clear, it seems they may be called like that because their shape does resemble a fig. This enema is also the namesake of the company that makes them (see below), so it may be best left untranslated.
A commemorative day established on this date because of the pun with the "Ichijiku" of "Ichijiku Farmaceutical Co. Ltd."!
The pun:
Ichijiku ≈ ichijuuku → ichi(1) juuku(19)clenchYou're kidding me, right...chillsAm I really supposed to put in something like this...?Eh...Experiencedpew
