The Book (Yoasobi EP)

The Book is the debut EP by Japanese duo Yoasobi. It was released on January 6, 2021, through Sony Music Entertainment Japan, the same date with their single "Kaibutsu", accompanied the second season of Beastars. A concept of "reading CD" with binder package, the EP consists of all singles released from 2019 to 2020, including other track "Encore". The track-by-track cover EP Mikunoyoasobi by Ayase with Vocaloid voicebank Hatsune Miku, was released on the same day exclusively at Tower Records Japan.

Commercial performance
The Book debuted at number two on the Oricon Albums Chart, behind SixTones's 1ST, selling 72,238 copies in its first week. and 146,745 copies as of 2021. It topped Oricon Digital Albums Chart for five consecutive weeks and the year-end chart with 100,656 downloads in 2021 alone, becoming the only album to reach this milestone in the year. For Billboard Japan Hot Albums, The Book entered at number two with 74,601 CD copies, and 10,069 download units. The Book received a gold certification for both physical and digital release by Recording Industry Association of Japan (RIAJ). All tracks of the EP, excluding the intro and outro, are also certified platinum or higher for streaming by RIAJ.

Credits and personnel

 * Ayase – songwriter, producer
 * Ikura – vocals (2–9)
 * Rockwell – guitar (4–5)
 * AssH – guitar (6)
 * Takeruru – guitar (8)
 * Plusonica – chorus (6)
 * Kanami Minakami – based story writer (2)
 * Shunki Hashizume – based story writer (3)
 * Sōta Ishiki – based story writer (4)
 * Shinano – based story writer (5)
 * Alfort Creative Team – based story writer (6)
 * Osamu Suzuki – based story writer (7)
 * Mayo Hoshino – based story writer (8)
 * Takayuki Saitō – vocal recording (2–8)
 * Masahiko Fukui – mixing
 * Hidekazu Sakai – mastering