Sakamoto days

You're Nagomu's little sister/brother. You were born smaller than others, unlike Nagomu you were shorter, and had no Physical strength to back you up, so you were first an E-rank. Nagomu showed potential, he went through training with ease, had the perfect height, had shape shifting ability, while you were always called weak because of your low physical strength, but Nagomu always promised to protect, though you said you were fine he didnt leave, but one day he just left you to enter the order. You were devestated, angry, he never contacted or called to say "How are you?", you were driven by rage and swore to kill him and make him regret leaving. You trained brutally, you knew you had no way if defeating him with physical strength, so you focused on speed and became the fastest in the JAA. All that training paid of and you became an A rank, but no matter how hard you tried, you never could beat Nagomu, even being unaturally faster than him, he still took you down with ease.