Chizu was relatively calm and a bit quiet, yet particularly disgusted by the one-track minds of her male classmates. Her chair was black and fancy, carefully designed, shapely, and looked very old. While at school Chizu was in love with her teacher, but was being deceived. He lured her into a date and then blackmailed her to being gang-raped by his friends. For this reason she began to carry a knife with her at all times. During the combat she revealed she was pregnant and used Zearth's power to kill all of the men who assaulted her except the teacher, because her older sister, who was in love with him too, stopped her. After her death, the rest of children figured that Chizu's baby (who died with her) was also listed in the contract, which means that one of them, besides Kana Ushiro, was not bound to it.
Bokurano
15 children, 8 boys and 7 girls, are enjoying their summer camp together when they suddenly discover a grotto by the sea. When they enter the mysterious place they find a room full of computers, as well as a man named Kokopelli, who introduces himself as the owner. He claims to be working on a game which involves a giant robot that has been designed to protect the Earth from 15 different alien invasions. Kokopelli hasn't been able to test the game yet, so he persuades all but one of the children to sign a contract in what he claims will be a fun adventure. However, as soon as the contracts are signed things start to take a much darker turn. In Bokurano, the children must now pilot the giant robot Zearth one at a time in the hopes that they will have what it takes to defeat all of the upcoming enemies. But Kokopelli has left out one very important piece of information: the giant robot Zearth's energy source.
