Thirteen

Mondo Fujieda is in love with a girl named Izayo Gorugo. However, there's a problem: her family are all assassins and he ends up humiliating her and upon this humiliation, she vows to kill him. Luckily for him she moves away. Years later, she comes back to seek vengeance, but what is a guy to do against a skilled assassin?

Oneshot featured in Gintama volume 24.