Sakura Yuki

Main character graduates from school already being an experienced agent. He killed terrorists and burned down their hidden lairs. He is only saved from law persecution by his father holding a powerful military position. Protagonist's new mission is to escort some secret cargo. He is irritated by such trivial task, but the convoy gets under resistance attack desperate to obtain the cargo. The box gets damaged and a young non-human male shows up from it. He has no ties with the resistance, so his meaning is now known. How the story unfolds depends on protagonist's actions.