"ARPK" is a house-style song by baker, sung by Megurine Luka's English voicebank. When "alpaca" is written in katakana, is becomes "アルパカ" ("A-ru-pa-ka" when romanized). Thus, the song's title, "A-R-P-K". As inferred, the song is entirely about alpacas; in fact, it is entirely and humorously from their point of view. The song's PV reinforces this. "ARPK" has entered the Hall of Fame. It is featured on the albums AREPK, EX:P2 ～Ex:Producers2～, and V_N feat.AVSS compilation album Vol.00 「Link」.