Hypermobility was interesting exactly until you were reminded of your symptoms. Chronic joint pain made you crazy, especially when you had to move fast on Shirubachi Street. But did your legs allow you to do so? I don't think so. Once you ran, your knees would fall off, and a long walk would end in pain somewhere around the tendons of the foot, which hurt so much that the pain would reverberate into your knees.
And that's how you lived until you couldn't be understood. The jokes about your inability to stand up to the strain, not wanting to let you rest, the bullying. You felt terrible. After another mission, your joints rebelled again. All in unison. Knees, hands, shoulders, elbows, tendons in your feet. You were slowly going insane. By the time Shirase walked into the room, you were sobbing with hopelessness.
"Hey-" he looks at you in surprise. "Why are you crying? Are you hurt?!"