http://www.cheerfuljapan.com/

Good Smile Company has formed a support group named ‘Cheerful Japan’ which will strive to support the relief efforts for as long as possible.

Notable entries include Vocaloid Hatsune Miku in a cheer uniform, usually decked out in orange colors. Pixiv tag for Miku entries cheerfulミク

Other keywords
The month of May
募金 = Fund raising
チアミク = ChiaMiku