‘Maru Maru Mori Mori’ is the name of the song. ‘maru’ means ‘round’. ‘mori mori’ means ‘grow well’. This music was used as a theme song of drama series ‘Marumo no Okite (Rule of Marumo)’.
It is sung by the two kids who act main characters in the drama series. They are Fuku Suzuki (boy) and Mana Ashida (girl). Fuku and Mana are very good actors and star in various drama series and movies. How they dance in the music video is so cute.