React is the first EP by Japanese band Wagakki Band and their first studio release under Universal Sigma. It was released on June 12, 2019 in three editions: CD only, CD with photo book, and CD with DVD. In addition, a Universal Music Store exclusive box set with all versions was released. The band conceptualized the EP as a way to express their belief with a strong will to deliver their music to people all over the world.
The EP peaked at No. 5 on Oricon's albums chart.
All tracks are arranged by Wagakki Band.