Lisa Sato, the mother of Jin Sato and Mina Sato, was the leader of a cryo-rights activist group on Kibou-daini. When her group discovered a potentially highly-costly secret about the cryo-corps, they made plans to reveal their knowledge in a public rally. However, they learned in advance of their plans and broke up the rally. She and several other members of her group were cryo-preserved on the grounds that they had gone insane and needed to await future treatment for their problems. This left Jin and Mina effectively orphans.