Tsukuru and colorless

Five high school friends, inseparable. Coincidentally, their names all refer to a color. The first is Akamatsu (meaning red pine), the second is Omi (meaning: blue sea), the third is Shiran (meaning: white root), and the fourth is Corona (meaning: black field). Only Sukuro Tazaki has no color in his name.Suddenly, these friends decide to cut ties with Tsukuru and Tazaki forever. This is how Socorr...