Vocaloid producers re-recording their own Caligula tracks with real vocals and rearranged instrumentation. The Caligula Effect on PS Vita had this wild concept where every dungeon song was written by a different Vocaloid artist, and ostinato is those same artists doing self-covers.
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"Peter Pan Syndrome" and "Sadistic Queen" both get this rawer, more human treatment compared to their in-game versions. "Distorted†Happiness" keeps that unhinged energy even in cover form, the dagger cross in the title really setting the tone.
"sin" strips things down to something darker and more personal. Nine tracks total. Compact but intense. Each one a different producer's style bleeding through. If you played Caligula and wondered what those songs would sound like outside the game's filter, this is exactly that answer.