Watarirouka Hashiritai 7 was a Japanese idol unit formed from members of AKB48.
The group originally started in 2008 as Watarirouka Hashiritai, evolving from a
smaller group called Okashina Sisters. With the addition of Natsumi Hirajima in
October 2008, the group officially became Watarirouka Hashiritai and debuted
with the single "Hatsukoi Dash/Aoi Mirai" in January 2009. In 2010, Ayaka
Kikuchi joined, and later that year, Misaki Iwasa and Mika Komori were added,
forming the special radio unit Watarirouka Hashiritai 7. Their first release
under this name was the hit "Valentine K...