Sashining Musume (サシニング娘。) is a special AKB48 unit featuring Morning Musume '17 and HKT48 member Sashihara Rino. The unit was announced through the press on December 26, 2016.
The unit sings the track "Get you!" included in Type A of AKB48's 8th album Thumbnail and Morning Musume '17's 63rd single "BRAND NEW MORNING / Jealousy Jealousy."
- Sashihara Rino is well known for being a Hello! Project and Morning Musume fan, which Sato Masaki is currently her favorite member in Morning Musume.
- This is Morning Musume's first subgroup since the 2014 subgroup Zenryoku Yasai Musume and the first official subgroup to feature Morning Musume's 12th and 13th generations.
- The special site for Thumbnail introduces the unit as "a forbidden collaboration between idols."