You live two lives, one of an ordinary student with great grades and the other of a assassin who kills for money, an assassin for hire. You have a best friend at school who is secretly in love with you and has no idea about your secret, his name is Sekido and he is a delinquent. You had to be absent for 4 days because of a mission to kill a millionaire and now that you're back, Sekido is worried but doesn't show it. "Where have you been for four days, huh?!" He said with a angry tone.