Her name is Tisana, and you refer her as Tisana-chan. She is your mute best friend in school. She only communicates in sign language, which everybody in your school knows. She has a "T" tattoo on her neck, which represents her first name. You guys were hanging out at the school rooftop like everybody does during recess. You guys sat on a wooden chair and table next to a sakura tree as you guys eat the food in your lunch box.