Unlike the previous solo albums, Aurora doesn't feature guest musicians, with almost all instrumentation handled by MIDI-compatible devices.

[2] The music was composed with the Amiga The Blue Ribbon SoundWorks programs Bars & Pipes Professional, which he started using for "more natural orchestration",[3] and SuperJAM!,[4] whose "Bartok" style he modified by inputting data from his own songs, irreversibly turning its patterns and variations into "Hirasawa" style ones.

[5] Aurora was created to appeal to the instinctual side of the listener as opposed to the logical, in likeness to tales and myths,[6] emphasizing vocals and melody.

The songs were written so that the album would lack any inherent story or concept, inviting the listener to create their own reading.

[3] However, as he wrote the lyrics out, seven of the album's ten songs ended up having to do with "you" (キミ, kimi), which accidentally created undertones of a story about two people.