HASHIMERO's first full album is a culmination work containing a total of 26 tracks, mainly consisting of songs released from the indie period through after his major debut. While tracing his journey so far, the album reconstructs both old and new songs as if sealing them in a "vacuum pack," delivering them in a fresh form through the breath of HASHIMERO in the present. The title "aero" reflects the wish that HASHIMERO's music blends into listeners' daily lives and exists as something natural and familiar like air. It includes "Tokihanate!" as the opening theme for the second cour of the TV anime "Witch Watch" and "yosumi" as the opening theme for the MBS drama "Ayaka-chan wa Hiroko Senpai ni Koishiteru 2nd Stage." With content enjoyable for anime and drama fans as well as music fans, this album condenses HASHIMERO's current position and new appeal together with a fresh selection of songs. The Blu-ray included in the Limited Edition contains HASHIMERO Studio Live "Shinku Pack." Comes in a sleeve case.