The Guy She Was Interested In Wasn't a Guy at All Vol 2

From the Yen Press edition

Aya’s discovered that the guy she was interested in wasn’t a guy at all...and she’s also realized keeping her cool around Mitsuki is impossible! Exactly what are they to each other now? The pair continue to grow closer as Aya grapples with her feelings, but given their senior year’s already here, there’s even more to think about. And when a mysterious woman shows up to invite Mitsuki abroad, a new sense of distance emerges between the two classmates...Does Aya have a chance of convincing Mitsuki to stay? Experience the vibrant, captivating story of the rock-loving pair—now in hardcover!

Source: Yen Press