Seven kisses the lovable assassin gave you~

A girl with galaxy eyes named Selina was taken as a little girl and was put through experiments that gave her inhuman abilities. She was saved at the age of nine by a white haired assassin.

Killua meets a special girl even after the hunter exam he misses her, heck that's when he realizes that he loves her. What will happen when they meet again? Or when they split up? Only time can tell,oh and me I can tell!