C.s.q.n.

Trivia

 * "c.s.q.n" is an acronym for Latin "conditio sine qua non" which means "indispensable conditions".
 * c.s.q.n featured in BOFXV. Scoring 147272 points, it came 6th.
 * This song can also be found in maimai, Lanota, Dance Rail, Muse Dash and O.N.G.E.K.I.