RihoRiho's Kouhaku vow

{With all this furore about Oda Sakura thinking about dyeing her hair and using an app to try mess around with the hair colour of not just herself but RihoRiho as well,  I thought I'd bring up this report from earlier this year}

Sayashi Riho   Unique vow   A bob cut for MoMusu. '14's Kouhaku appearance!?

Morning Musume.'14's Sayashi Riho (15) took a unique vow.
Setting forth on this year's great goal of making an appearance at the NHK Kouhaku Uta Gassen on the very last day of the year, 'If we're able to make an appearance, for the sake of welcoming the new year with a fresh feeling, I would like to lop off my hair,' she declared.

Source
Related matome 1 | 2 | 3

As a bonus, here's a rendition (not mine) of how RihoRiho would look like with a bob cut:



And a short cut: