Shanghai

Shanghai is one of the secondary characters in the Sonny Boy series. Shanghai is a foreign transfer student, almost certainly from China (given her name and language). She often hangs out with Ace, perhaps being his girlfriend. Some time after the class starts drifting through the darkness, Shanghai cooperates with Asakaze and another student in their attempted coup against the student council, having been told that Cap would not be able to give them "penalties". However, she ends up getting a penalty anyway and forced to do sit-ups for some time. After the class ends up in the island world...