Sanpon Ribbon (サンボンリボン) is a trio unit consisting of the three Harumi sisters, who are Sawara, Kajika and Shinju.
- Sawara Harumi - The oldest sibling of the three who is 19 years old. Her image color while in Sanpon Ribbon is aqua.
- Kajika Harumi - The second oldest sibling who is 14 years old. Her image color while in Sanpon Ribbon is pink.
- Shinju Harumi - The youngest sibling who is only 10 years old. Her image color in Sanpon Ribbon is yellow.
- たいくつりぼん (Taikutsu Ribbon) - The debut song for Sanpon Ribbon.
- セカイのヒミツ (Sekai no Himitsu)
- This is the only unit within 777☆SISTERS where the only members are related.