Watarirouka Hashiritai 7 (渡り廊下走り隊7), formerly Watarirouka Hashiritai, was an AKB48 sub-unit. The group is a revival of the Onyanko Club unit Ushirogami Hikaretai. On November 14, 2013, the sub-unit announced their disbandment. Their final concert was held on February 9, 2014 at Zepp Diver City, Tokyo.
Hirajima Natsumi (Graduated in February, 2012)
Komori Mika (Graduated in June, 2013)
Ota Aika (HKT48)
Okashina Sisters (お菓子なシスターズ) was a subgroup from AKB48 before Watarirouka Hashiritai. It was created in 2008 to sing the ending theme of the anime Mircale Mimika. The ending theme they sung "Koi no Chewing" (恋のチューイング) wasn't released as a single own it's on but as a c/w for Watarirouka Hashiritai's first single Hatsukoi Dash/Aoi Mirai. Later, when Hirajima Natsumi joined Okashina Sisters, the group was renamed Watarirouka Hashiritai.