sennen_no_chikai_no_hate_ni_(vocaloid)
English: At the End of a Millennium Vow
A song by mothy featuring Hatsune Miku released as part of the Evillious Nendaiki Miku Symphony album release. It's sung from the perspective of Michaela (evillious nendaiki), and serves as a spiritual successor to Sennen no Wiegenlied (vocaloid).