4℃ is pronunced Yon Do. The band gave away free stickers with a purchase of the album. ネガイアル(Album title) is an acronym for ネガティブと願いのスパイラル(NEGATIVE to Negai no SPIRAL) which takes on the phonetics of (NE)gative, Ne(Gai), Spi(RAL). Which translates to a "Spiral of Negativity and Wishes".