"Meltdown" is iroha(sasaki)'s most popular work. It is also widely considered Kagamine Rin's best-known song of all time. There are various interpretations of this song. The PV can be literally interpreted as Rin jumping into a nuclear reactor to commit suicide, or it can be interpreted figuratively as Rin trying to get rid of her past or purge herself of her sins in order to grow up and become an adult. This song is featured in the EXIT TUNES compilation album Vocalostar.