The 15-year journey of "Oregairu" comes together in this one volume! Celebrating the 15th anniversary of the series and worldwide cumulative sales surpassing 15 million copies! It features previously unpublished early "Oregairu" materials and lavish interviews looking back on those days. It also includes "15" celebratory columns full of laughs and emotion! The fan must-read mook packed with 15 years of history has finally arrived.