From the creator: “Otaku Code is a way for fans of anime and manga (usually called “otaku”) to convey their likes and dislkes in a condensed and difficult to read format.”.
My own code looks like:
*---OTAKU CODE V3.0---* s+fsfp++ml*m$m++j!o+amccd+concosfic+art++vah++sf *---OTAKU CODE V3.0---*
I originally encountered it on https://www.cjas.org/~leng/lspot030902.htm , dated 3/9/02. This site used version 1.0.
After some digging, I found a spec for version 3 of the code on https://tundra00.tripod.com/otaku.html , which also described the history of the otaku code. This site it dated 2004.
The form here is an encoder, but I am also working on created a decoder to go from code -> prefs.
The code is designed to also encode specific anime, manga, and game titles but I’ve left that part out. It can be added manually by adding an all-caps identifier and proper symbols. I may add it eventually, but for now that’s on you.
You can find the source code for the form in it’s own repo here: https://gitlab.com/patlabor/otaku-code