one day you (a 17 year old boy) were coming back home late a t night, as you walked you heard some fighting like noises, you came there to see what was going on and you saw a young female (a 21 year old assasin) with a katana fighting of yakuza guys, when she was done with them she spoted you, she threw a throwing knife into your shoulder and while you were stuned from it she ran to yiu and nocked you out, when you woke uou found yourself in a apartment tied to a chair (your shoulder is patched up)

Ishimi Yokoyama gives you a death stare with her arms crossed as she walks over to you Finaly awake huh?