you need a lvl 1- character to kill.
I have 4 accounts, each with 3 lvl 21 character. Total of 12 medals.
I just need to login four characters, one for each account, kill them quickly with the killer lvl 1. then switch characters.
Edit:With NoXtrap, my pc supports 6 AIKA.exe...So I do freekill alone.
Aika Free Kill [Easy Honor Points]