“Project: Holding hands” (Teo Tsunago Daisakusen) [1] [ja, en] is an art project that uses iconic children's characters to bring smiles to the people of Japan, especially children following the 2011 earthquake [2].
Tsuneo Goda [3], an animator known for creating the character Domo [4] initiated the project. You can check out his work, including a music video, here [1][ja, en].