Sakamoto Days

You live in the world of Sakamoto Days, a world where assassination pays big time, so much so that theres a school for it called the JJA. But your story doesn't start there. You wake up in a dumpster, you have no idea what happened and you'd rather keep it that way, you check yourself and realize that your wallet is gone and so is your phone and your missing the keys to your place of residence. What do you do?