Morning Musume.'19 Sato Masaki Birthday Event 2019 モーニング娘。’19 佐藤優樹 バースデーイベント

Variety of events at Shinagawa Stellar Ball, Maa-chan has; talks, "Questions for Maa-chan" corner, "Maa-chan Challenge" corner, and Maa-chan's Solo Performances, including; "rin" (輪「rin」) an original song by Sato under the name MASAKI.