Sato is a student of Otogi Academy that arrived seeking the help the Otogi Bank. Her ex-boyfriend had been trying to intimidate her into reconciliation. At the time, all the girls of the Otogi Bank were out shopping, but Ryoshi Morino and Taro Urashima were present. Still, she kept the purpose of her vist to herself. She insisted on speaking to Ryoko about her troubles. So, Ryoshi called her back to the Otogi Bank.
At the Otogi Bank, Sato explained her situation. She had told them she agreed to meet her ex-boyfriend, but was sure he would use force in order to get him to see her. She asked Ryoko to go in her place to get him to back off. As with all deals of the Otogi Bank, she pledged her assistance to the Otogi Bank on the time of their choosing.
Ryoko arrived at the meeting place with Ryoshi, but this had all been an ambush set up by the students of Onigashima High School. The gang of delinquents where there armed and in force, but Ryoko had neglected to bring her Kitty Knuckles. Ryoshi tried to shield Ryoko and was strike in the head and fell unconscious. Ryoko was overwhelmed and was abducted.
When Ryoshi finally returned to the Otogi Bank. The other members had discovered that Sato had been threatened into creating this trap by the Onigashima Boss. With Ryoshi's hunting skills, the Otogi Bank were able to rescue Ryoko from the Onigashima delinquents and bring her back home to Otogibana City.