Wielding little more than drums and a keyboard, Osaka-based duo HYPER GAL are waging a perpetual loudness war against themselves. Formed in the late 2010s, the band was inspired by the anarchic creativity of Japanese noise acts like Melt-Banana , Solmania, and Boredoms . But while their forebears deconstructed rock conventions, HYPER GAL’s primary influence is the glistening textures of pop. Their songwriting formula is bracingly simple: Kurumi Kadoya loops a keyboard phrase, pushing the volume until the melody grinds into a thick harmonic paste. Then she lays into the drums, heavy on the cymbals, while her bandmate Koharu Ishida half-sings and half-raps with a dreamy detachment. The band’s 2021 debut album, Pure , which caught the attention of Chicago’s Skin Graft Records, relied on harsh distortion and eccentric mixing in the trebly vein of Wavves or Times New Viking . Since signing, they’ve hit the studio and polished their sound.…