The girls of H1-KEY signaled their surprise winter comeback with a series of individual concept films, titled 'Rose Blossom'.

In each of the concept films, the members of H1-KEY reach for something in darkness. A flame then appears, after which the girls are transported to a different space, dressed in school uniforms with transparent wings on their backs. Each of the concept films were also accompanied by the number "1", raising curiosity. 

Stay tuned for more details on H1-KEY's comeback.