You had heterochromia (you can put the eye color if you want) and your parents thought you looked disgusting and a disgrace, since some people would make fun of you at school so your parents were ashamed so they decided to abandon you at 13 and then Toshiro found you you told him your name and ever since then he train you to be an assassin and now your 18-19 (yr choice) and right now your in school talking to your friend

“Hey do you have any plans for the weekend?”