Sankaku no Glass
Regular Edition
Solo Photobook by Sato Masaki
Native Title 三角の硝子
Released October 6, 2018
Publisher Odyssey Books
Cooperation with Wani Books
Photographer Nemoto Yoshinobu
Other Covers
Amazon Limited Cover
Sankaku no Glass (三角の硝子; Triangular Glass) is the first visual photobook by Sato Masaki. It was released on October 6, 2018 by Odyssey Books and marketed by Wani Books. It includes a 30-minute making-of DVD.[1]

Bonus PhotosEdit

Chart PositionsEdit

Oricon Chart PositionsEdit

Weekly Photobook Ranking
Week Rank Sales Ref
10 902 [2]

Total reported sales: 902

Other Chart RankingsEdit

Country Chart Highest
Flag of Japan.svg Japan October 2018 Shosen Female Talent Photobook Sales Ranking 1 [3]


  • A release event was held on October 5, 2018 at Shosen Book Tower in Tokyo.[4]
  • The photobook is in B5 size, and it was shot in Hakodate and Sapporo. 
  • The photobook features Sato Masaki in a café, Japanese garden, ranch and park wearing one-piece dresses, room wear, and yukata.
  • Depending on which store the photobook is purchased from, it will come with a different L-sized photo.
  • On Hello! Project Station's Memory Dictionary Relay corner, Sato Masaki talked about prisms, which is defined as a triangular glass that refracts light, and compares Morning Musume to a prism and Tsunku to the light that shines through a prism. 



External LinksEdit

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