SKE48 will release their 27th single "Koi Ochi Flag" on February 3, 2021. 

Members Matsui Jurina, Ego Yuna, and Fukushi Nao revealed the details on the new single's title and release date on November 23 via a broadcast on YouTube and SHOWROOM. "Koi Ochi Flag" will be released to commemorate Matsui's graduation from the group. All members will participate in the title track besides Shirai Kotono, Takayanagi Akane, and Kataoka Narumi, who have all announced their graduation, and Shirai Yukino due to her poor health. 

The upcoming single will be released in Limited Edition Types A ~ C, Regular Edition Types A ~ C, Seven Net Edition Types A ~ C, and a Theater Edition. The tentative track list can be seen below.

===

[Koi Ochi Flag]

Type-A

CD

01. Koi Ochi Flag
02. Untitled A
03. Koi Ochi Flag off vocal
04. Untitled A off vocal

DVD

01. Koi Ochi Flag Music Video
02. Untiled A Music Video
03. Untitled Special Footage 

Type-B

CD

01. Koi Ochi Flag
02. Untitled B
03. Koi Ochi Flag off vocal
04. Untitled B off vocal

DVD

01. Koi Ochi Flag Music Video
02. Untitled B Music Video
03. Untitled Special Footage

Type-C

CD

01. Koi Ochi Flag
02. Untitled C
03. Koi Ochi Flag off vocal
04. Untitled C off vocal

DVD

01. Koi Ochi Flag Music Video
02. Untitled C Music Video
03. Untitled Special Footage

Theater Edition

CD

01. Koi Ochi Flag
02. Untitled D
03. Koi Ochi Flag off vocal
04. Untitled D off vocal