Microburst (驟雨, Shūu, lit. "sudden rain") is an ability used jointly by Yato and Rekki in his bow-and-arrow form. Yato defines it as a scattershot of Rekki's Crimson Petals. According to Father, it works by altering a fire-suppression song into a rain of arrowheads.
Yato signals the use of this ability in the same way as Crimson Petals: commanding, "Sing, Rekki!" (唱え暦器Utae, Rekki), followed by the title of the attack.