The Book For,

The Book For, is the fourth Japanese-language EP by Japanese duo Yoasobi. Released on June 26, 2026, through Echoes and Sony Music Entertainment Japan, it is the follow-up to the duo's third EP The Book 3 (2023), and serves as the fourth and final installment of The Book series. Solely written and produced by Ayase, The Book For, comprises 12 tracks of singles released from late 2023 to early 2026, and the collaborative track with Overwatch, "Orion". Commercially, the EP debuted at number seven on the Oricon Albums Chart and number nine on the Billboard Japan Hot Albums.