Satō Matsuzaka (松坂 さとう Matsuzaka Satō), also spelled Satou Matsuzaka, is the main heroine of Happy Sugar Life. She is a first-year student attending Makisuhara High School who finally learns what true love means for the first time after meeting a young girl called Shio Kōbe, falling in love with her and living with her in a shared apartment.

Publicly, she tells people and writes in documents that she resides with her aunt, and keeps the fact that she lives with Shio a secret and does everything